Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net Loss Attributable to Parent	$ (3,686)	$ (12,949)	$ (16,816)	$ (37,370)
Dividends	6,374	6,258	12,749	12,513
Dividends attributable to common stockholders under the two class method	6,164	6,053	12,324	12,102
Net loss available to common stockholders, basic	$ (3,896)	$ (13,154)	$ (17,241)	$ (37,781)
Weighted-average common shares outstanding - basic	49,423,472	48,543,334	49,318,423	48,436,946
Weighted Average Number Diluted Shares Outstanding Adjustment	0	0	0	0
Weighted-average common shares outstanding - diluted	49,423,472	48,543,334	49,318,423	48,436,946
Basic earnings (loss) per share	$ (0.08)	$ (0.27)	$ (0.35)	$ (0.78)
Diluted earnings (loss) per share	$ (0.08)	$ (0.27)	$ (0.35)	$ (0.78)