Contractual interest rate for funds borrowed, under the debt agreement.

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Debt Debt Redemptions and Repurchases (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2014	Dec. 31, 2015	Dec. 31, 2014	May. 30, 2014
6.75% senior notes due November 2020
Debt Instrument
Interest rate on debt instrument (as a percent)		6.75%
6.375% senior notes due September 2022
Debt Instrument
Interest rate on debt instrument (as a percent)		6.375%
Senior Notes [Member]
Debt Instrument
Debt repurchase amount		$ 65,000
Repayments of Long-term Debt		55,000
Gain on extinguishment of debt		11,000
Senior Notes [Member] \| 10.25% Senior notes due 2014
Debt Instrument
Debt repurchase amount	$ 321,000
Interest rate on debt instrument (as a percent)			10.25%	10.25%
Senior notes, net				$ 205,000
Senior Notes [Member] \| 6.75% senior notes due November 2020
Debt Instrument
Debt repurchase amount	30,000	$ 39,000
Interest rate on debt instrument (as a percent)		6.75%
Senior Notes [Member] \| 6.375% senior notes due September 2022
Debt Instrument
Debt repurchase amount	$ 837,000	$ 26,000
Interest rate on debt instrument (as a percent)		6.375%