Guarantor Subsidiaries Financial Information Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Long-term Debt	$ 2,724,672	$ 2,705,718
Senior notes due April 2020 at 8.25%
Condensed Financial Statements, Captions [Line Items]
Long-term Debt	$ 74,470	74,470
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Senior Secured Notes due April 2022 [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term Debt	$ 1,854,731
Senior Notes Due April 2017 at 8.00%
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.25%
Senior notes due March 2021 at 6.375%
Condensed Financial Statements, Captions [Line Items]
Long-term Debt	$ 20,611	20,611
Debt Instrument, Interest Rate, Stated Percentage	5.875%
Senior Notes due April 2023 [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term Debt	$ 494,344	$ 493,439
Senior Notes 8 Percent Due April 2023 Par Value [Member] [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.00%