Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basic earnings (loss) per share:
Net loss	$ (71,165)	$ (34,535)
Dividends declared on preferred stock	(5,480)	(5,481)
Net loss available to common shareholders	$ (76,645)	$ (40,016)
Weighted average shares	94,850,791	96,783,199
Basic earnings (loss) per share	$ (0.81)	$ (0.41)
Diluted earnings (loss) per share:
Net loss	$ (71,165)	$ (34,535)
Dividends declared on preferred stock	(5,480)	(5,481)
Net income (loss) available to common shareholders	$ (76,645)	$ (40,016)
Weighted average shares	94,850,791	96,783,199
Diluted weighted average shares	94,850,791	96,783,199
Diluted earnings (loss) per share	$ (0.81)	$ (0.41)