Basis of Presentation and Significant Accounting Policies - Recent Accountinng Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Senior Notes
Debt Instrument [Line Items]
Deferred loan costs	$ 13,358
Senior Notes | 5 3/4% Senior Notes due 2019
Debt Instrument [Line Items]
Deferred loan costs	1,700	$ 2,200
Senior Notes | 8 1/2% Senior Notes due 2020
Debt Instrument [Line Items]
Deferred loan costs	6,000	7,300
Senior Notes | 7% Senior Notes due 2022
Debt Instrument [Line Items]
Deferred loan costs	5,600	5,200
Revolving Credit Facility
Debt Instrument [Line Items]
Deferred loan costs	$ 1,400	$ 1,300