Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net loss available to common stockholders, basic	$ (14,252)	$ (40,573)	$ (26,082)	$ (50,538)
Weighted Average Number of Shares Outstanding, Basic	50,499,248	50,015,869	50,416,611	49,970,709
Weighted Average Number Diluted Shares Outstanding Adjustment	0	0	0	0
Weighted Average Number of Shares Outstanding, Diluted	50,499,248	50,015,869	50,416,611	49,970,709
Earnings Per Share, Basic and Diluted	$ (0.28)	$ (0.81)	$ (0.52)	$ (1.01)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,598,443	880,974	4,598,443	2,214,674
Maximum [Member]
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount	$ 6.75	$ 13.38	$ 6.75	$ 13.38