Earnings Per Common Share (Basic and Diluted EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Income (loss) attributable to common stockholders									$ (4,831)	$ 94,032	$ 21,655
Weighted Average Number of Shares Issued, Basic									41,260,000	38,828,000	38,321,000
Weighted average common shares outstanding, basic (in shares)									41,260,000	38,828,000	38,321,000
Weighted average common shares outstanding, diluted (in shares)									41,260,000	39,291,000	38,865,000
Basic EPS
Net income (loss) per share (in dollars per share)	$ (0.16)	$ 0.10	$ 0.05	$ (0.09)	$ 0.10	$ 0.19	$ 2.17	$ (0.04)	$ (0.12)	$ 2.42	$ 0.57
Diluted EPS
Net income (loss) per share (in dollars per share)	$ (0.16)	$ 0.10	$ 0.05	$ (0.09)	$ 0.10	$ 0.19	$ 2.14	$ (0.04)	$ (0.12)	$ 2.39	$ 0.56
Restricted Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements									0	463,000	544,000