Earnings Per Share Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net (loss) income, as reported	$ (161,563)	$ (3,265)	$ (150,470)	$ 33,152
Less: Dividends distributed to Warrants	40	172	88	172
Less: Undistributed earnings allocated to Warrants	0	0	0	497
Net (loss) income attributable to common shareholders for basic EPS	(161,603)	(3,437)	(150,558)	32,483
Add: Undistributed earnings allocated to dilutive securities	0	0	0	1
Net (loss) income attributable to common shareholders for diluted EPS	$ (161,603)	$ (3,437)	$ (150,558)	$ 32,484
Weighted average shares outstanding - basic (shares)	91,676	95,337	92,083	95,374
Impact of dilutive securities (shares)	0	0	0	191
Weighted average shares outstanding - diluted (shares)	91,676	95,337	92,083	95,565
Basic (usd per share)	$ (1.76)	$ (0.04)	$ (1.64)	$ 0.34
Diluted (usd per share)	$ (1.76)	$ (0.04)	$ (1.64)	$ 0.34