Earnings per Share - Schedule of Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net Income (Loss)	$ 27,931	$ 20,523	$ 74,987	$ 34,296
Noncontrolling interests	(933)	(1,731)	(1,619)	(2,782)
Net Income (Loss) Attributable to Stockholders	26,998	18,792	73,368	31,514
Preferred stockholder dividends	(2,085)	(2,084)	(6,253)	(6,252)
Net Income (Loss) Attributable to Common Stockholders	$ 24,913	$ 16,708	$ 67,115	$ 25,262
Shares:
Basic: Weighted-average number of common shares outstanding (in shares)	7,175	7,212	7,195	6,942
Plus: Incremental shares from assumed conversion of dilutive instruments (in shares)	1,281	1,280	1,268	226
Diluted: Weighted-average number of common shares outstanding (in shares)	8,456	8,492	8,463	7,168
Earnings (Loss) per share—Basic (in $ per share)	$ 3.47	$ 2.32	$ 9.33	$ 3.64
Earnings (Loss) per Share—Diluted (in $ per share)	$ 3.19	$ 2.21	$ 8.67	$ 3.52