Long-Term Debt (Break-Down Of Long-Term Debt) (Details) (USD $)
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Mar. 31, 2014
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Dec. 31, 2013
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Mar. 31, 2014
Line of Credit [Member]
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Dec. 31, 2013
Line of Credit [Member]
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Mar. 31, 2014
Building loans [Member]
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Dec. 31, 2013
Building loans [Member]
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Mar. 31, 2011
Building loans [Member]
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Mar. 31, 2014
7.75% senior unsecured notes due 2020 [Member]
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Dec. 31, 2013
7.75% senior unsecured notes due 2020 [Member]
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Oct. 17, 2012
7.75% senior unsecured notes due 2020 [Member]
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Debt Instrument [Line Items] | |||||||||||||||||||||||||||
Long-tern debt | $ 0 | [1] | $ 0 | [1] | $ 1,953,000 | [2] | $ 1,995,000 | [2] | $ 2,400,000 | $ 300,000,000 | [3] | $ 300,000,000 | [3] | $ 300,000,000.0 | [3] | ||||||||||||
Unamortized original issue (discount) premium, net | (2,730,000) | [4] | (2,808,000) | [4] | |||||||||||||||||||||||
Current maturities of long-term debt | (161,000) | (159,000) | |||||||||||||||||||||||||
Long-term debt, net of current maturities | $ 299,062,000 | $ 299,028,000 | |||||||||||||||||||||||||
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