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Long-Term Debt (Break-Down Of Long-Term Debt) (Details) (USD $)
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Mar. 31, 2015
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Dec. 31, 2014
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Mar. 31, 2011
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Aug. 18, 2014
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Dec. 21, 2012
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Oct. 17, 2012
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| Debt Instrument [Line Items] | ||||||||||||||||
| Unamortized original issue (discount) premium, net (4) | $ 14,130,000 | [1] | $ 14,658,000 | [1] | ||||||||||||
| Less: current maturities of long term debt | (1,781,000) | (168,000) | ||||||||||||||
| Long-term debt, net of current maturities | 779,130,000 | 716,316,000 | ||||||||||||||
| Line of Credit [Member] | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Long-term debt | 165,000,000 | [2] | 100,000,000 | [2] | ||||||||||||
| Building loans [Member] | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Long-term debt | 1,781,000 | [3] | 1,826,000 | [3] | 2,400,000 | |||||||||||
| 7.75% senior unsecured notes due 2020 [Member] | ||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||
| Long-term debt | $ 600,000,000 | [4] | $ 600,000,000 | [4] | $ 600,000,000.0 | $ 600,000,000.0 | $ 600,000,000.0 | |||||||||
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