Long-Term Debt (Schedule of Carrying Values and Estimated fair Values of Debt Instruments) (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Carrying Value [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value	$ 377,057
Carrying Value [Member] | Senior Notes [Member] | Term Loan Due 2017 [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value	180,107
Carrying Value [Member] | Level 2 [Member] | Senior Notes [Member] | 9% Senior Unsecured Notes Due 2018 [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value	196,950
Estimated Fair Value [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value	376,072
Estimated Fair Value [Member] | Senior Notes [Member] | Term Loan Due 2017 [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value	180,107
Estimated Fair Value [Member] | Level 2 [Member] | Senior Notes [Member] | 9% Senior Unsecured Notes Due 2018 [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value	$ 195,965