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Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	May. 13, 2014	May. 28, 2013
Debt Instrument [Line Items]
Long-term debt, gross	$ 985,000	$ 959,000
Unamortized discount on Senior Notes	(18,889)	(20,124)
Total Long-Term Debt	$ 966,111	938,876
Senior notes \| 8% Senior Notes due 2020
Debt Instrument [Line Items]
Stated interest rate	8.00%
Long-term debt, gross	$ 300,000	300,000
Senior notes \| 6.625% Senior Notes due 2021
Debt Instrument [Line Items]
Stated interest rate	6.625%
Long-term debt, gross	$ 550,000	550,000	$ 300,000	$ 250,000
Credit facility due 2019
Debt Instrument [Line Items]
Long-term debt, gross	$ 135,000	$ 109,000