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Long-Term Debt (Narrative) (Details) (USD $)
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3 Months Ended | 3 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | |||||||||||||||
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Mar. 31, 2012
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May 02, 2012
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Dec. 31, 2011
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Oct. 31, 2011
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May 03, 2011
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Dec. 24, 2010
Bank Of Nova Scotia [Member]
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Sep. 30, 2010
Bank Of Nova Scotia [Member]
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Mar. 31, 2012
Base Rate [Member]
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Mar. 31, 2012
Federal Funds Rate [Member]
Base Rate Loans [Member]
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Mar. 31, 2012
One-Month Euro Dollar Rate [Member]
Base Rate Loans [Member]
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Mar. 31, 2012
Maximum [Member]
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Mar. 31, 2012
Maximum [Member]
Base Rate [Member]
Base Rate Loans [Member]
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Mar. 31, 2012
Maximum [Member]
Base Rate [Member]
Eurodollar Loans [Member]
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Mar. 31, 2012
Minimum [Member]
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Mar. 31, 2012
Minimum [Member]
Base Rate [Member]
Base Rate Loans [Member]
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Mar. 31, 2012
Minimum [Member]
Base Rate [Member]
Eurodollar Loans [Member]
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Mar. 31, 2012
Euro Dollar Loans [Member]
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Mar. 31, 2012
Base Rate Loans [Member]
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Mar. 31, 2011
Building Loan [Member]
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Mar. 31, 2012
Building Loan [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||||||
| Revolving credit facility | $ 350,000,000 | $ 100,000,000 | ||||||||||||||||||
| Borrowing capacity | 155,000,000 | 125,000,000 | 90,000,000 | 65,000,000 | 50,000,000 | |||||||||||||||
| Company's borrowings, outstanding principal amount | 10,000,000 | |||||||||||||||||||
| Loan, periodic monthly payment | 22,000 | |||||||||||||||||||
| Building loan, outstanding amount of building loan refinanced | $ 2,400,000 | |||||||||||||||||||
| Interest rate description | The interest rate for eurodollar loans is equal to (1) the applicable rate, which ranges from 2.00% to 3.50%, plus (2) the London interbank offered rate that appears on Reuters Screen LIBOR01 Page for deposits in U.S. dollars, or, if such rate is not available, the offered rate on such other page or service that displays the average British Bankers Association Interest Settlement Rate for deposits in U.S. dollars, or, if such rate is not available, the average quotations for three major New York money center banks of whom the agent shall inquire as the "London Interbank Offered Rate" for deposits in U.S. dollars. | The interest rate for base rate loans is equal to (1) the applicable rate, which ranges from 1.00% to 2.50%, plus (2) the highest of: (a) the federal funds rate plus 0.5%, (b) the rate of interest in effect for such day as publicly announced from time to time by agent as its "prime rate," and (c) the eurodollar rate for an interest period of one month plus 1.00%. | ||||||||||||||||||
| Stated interest rate, per annum | 5.82% | |||||||||||||||||||
| Debt instrument, base interest rate before basis spread or other rate adjustments, percent | 2.50% | 3.50% | 1.00% | 2.00% | ||||||||||||||||
| Debt instrument, basis spread on variable rate | 0.50% | 1.00% | ||||||||||||||||||
| Line of Credit Facility, Interest Rate During Period | 4.25% | |||||||||||||||||||
| Ratio of funded debt to EBITDAX necessary to maintain covenants | 2.00 | |||||||||||||||||||
| Ratio of EBITDAX to interest expense necessary to maintain covenants | 3.00 | |||||||||||||||||||
| Financial covenants | (1) the ratio of funded debt to EBITDAX (net income, excluding any non-cash revenue or expense associated with swap contracts resulting from ASC 815, plus without duplication and to the extent deducted from revenues in determining net income, the sum of (a) the aggregate amount of consolidated interest expense for such period, (b) the aggregate amount of income, franchise, capital or similar tax expense (other than ad valorem taxes) for such period, (c) all amounts attributable to depletion, depreciation, amortization and asset or goodwill impairment or writedown for such period, (d) all other non-cash charges, (e) non-cash losses from minority investments, (f) actual cash distributions received from minority investments, (g) to the extent actually reimbursed by insurance, expenses with respect to liability on casualty events or business interruption, and (h) all reasonable transaction expenses related to dispositions and acquisitions of assets, investments and debt and equity offering, and less non-cash income attributable to equity income from minority investments) for a twelve-month period may not be greater than 2.00 to 1.00; and (2) the ratio of EBITDAX to interest expense for a twelve-month period may not be less than 3.00 to 1.00. | |||||||||||||||||||