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Long-Term Debt (Break-Down Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
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Dec. 31, 2013
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Mar. 31, 2011
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Aug. 18, 2014
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| Debt Instrument [Line Items] | |||||||||||||||
| Long-tern debt | $ 701,826 | ||||||||||||||
| Unamortized original issue (discount) premium, net | 14,658 | [1] | (2,808) | [1] | |||||||||||
| Current maturities of long-term debt | (168) | (159) | |||||||||||||
| Long-term debt, net of current maturities | 716,316 | 299,028 | |||||||||||||
| Line of Credit [Member] | |||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||
| Long-tern debt | 100,000 | [2] | 0 | [2] | |||||||||||
| Building loans [Member] | |||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||
| Long-tern debt | 1,826 | [3] | 1,995 | [3] | 2,400 | ||||||||||
| 7.75% senior unsecured notes due 2020 [Member] | |||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||
| Long-tern debt | $ 600,000 | [4] | $ 300,000 | [4] | $ 600,000 | [4] | |||||||||
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