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Senior Notes - Summary (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Senior Notes - Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Debt
Total Senior Notes	$ 295,000		$ 295,000		$ 326,793
Deferred debt issuance costs	(4,684)		(4,684)		(5,877)
Debt discount	(58)		(58)		(70)
Total Senior Notes, net	290,258		290,258		320,846
Interest Paid	11,400	$ 2,000	24,500	$ 24,000
Senior Notes \| 7.50% Senior Convertible Notes due 2016
Debt
Total Senior Notes	0		0		46,793
Senior Notes \| 8.5% Senior Notes Due 2019
Debt
Total Senior Notes	200,000		200,000		200,000
Senior Notes \| 6.00% Senior Convertible Notes Due 2020
Debt
Total Senior Notes	80,000		80,000		80,000
Senior Secured Credit Facility
Debt
Total Senior Notes	$ 15,000		$ 15,000		$ 0