Long-Term Debt (Break-Down Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Mar. 31, 2011
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Debt Instrument [Line Items] | ||||||||||||||
Long-tern debt | $ 302,143 | |||||||||||||
Unamortized original issue (discount) premium, net | (3,034) | (3,105) | [1] | 0 | [1] | |||||||||
Less: current maturities of long term debt | (152) | (150) | (141) | |||||||||||
Long-term debt, net of current maturities | 298,921 | 298,888 | 2,142 | |||||||||||
Building loans [Member]
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Debt Instrument [Line Items] | ||||||||||||||
Long-tern debt | 2,107 | 2,143 | [2] | 2,283 | [2] | 2,400 | ||||||||
7.75% senior unsecured notes due 2020 [Member]
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Debt Instrument [Line Items] | ||||||||||||||
Long-tern debt | 300,000 | 300,000 | [3] | 0 | [3] | |||||||||
Line of Credit [Member]
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Debt Instrument [Line Items] | ||||||||||||||
Long-tern debt | [4] | [4] | ||||||||||||
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