Quarterly Consolidated Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 89,228	$ 120,366	$ 95,797	$ 103,769	$ 118,190	$ 80,958	$ 78,702	$ 70,497	$ 409,160	$ 348,347
Net income attributable to common shareholders	$ 4,156	$ 23,232	$ 16,144	$ 20,056	$ 17,274	$ 8,834	$ 7,528	$ 6,261	$ 63,588	$ 39,898
Basic earnings per common share (in dollars per share)	$ 0.71	$ 3.97	$ 2.75	$ 3.47	$ 2.99	$ 1.50	$ 1.28	$ 1.03	$ 10.90	$ 6.75
Diluted earnings common share (in dollars per share)	$ 0.68	$ 3.81	$ 2.66	$ 3.35	$ 2.91	$ 1.47	$ 1.26	$ 1.00	$ 10.50	$ 6.60
Basic weighted average common shares outstanding (in shares)	5,850	5,847	5,866	5,779	5,782	5,900	5,878	6,104	5,836	5,915
Diluted weighted average common shares outstanding (in shares)	6,099	6,094	6,061	5,978	5,939	6,004	5,991	6,256	6,058	6,046