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Long-Term Debt (Additional Required Disclosures) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
2023 Senior Notes [Member]      
Debt Instrument [Line Items]      
Interest Expense $ 31,387 $ 31,387 $ 8,196
Amortization of financing costs 439 438 109
Amortization of premium 515 506 123
2016 Notes [Member]      
Debt Instrument [Line Items]      
Interest Expense 20,991 29,490 32,172
Amortization of financing costs 805 778 777
Amortization of premium (496) (692) (754)
2019 Notes [Member]      
Debt Instrument [Line Items]      
Interest Expense 0 0 18,765
Amortization of financing costs 0 0 3,056
Amortization of premium $ 0 $ 0 $ 1,802