Earnings Per Share (Details 1) - USD ($) $ / shares in Units, $ 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	Dec. 31, 2017
Earnings Per Share [Abstract]
Restricted common shares									0.66%	0.61%	0.71%
Earnings per common share — Basic:
Income from continuing operations	$ 47,318	$ 43,335	$ 31,112	$ 34,810	$ 103,837	$ 36,332	$ 50,203	$ 57,547	$ 156,575	$ 247,919	$ 147,874
Less: Distributed and undistributed earnings allocated to restricted common shares(1)									(1,034)	(1,517)	(1,045)
Income from continuing operations available to common shareholders — Basic									$ 155,541	$ 246,402	$ 146,829
Weighted-average common shares outstanding — Basic									74,477,865	77,447,263	78,219,458
Net income per share (in dollars per share)	$ 0.63	$ 0.58	$ 0.41	$ 0.46	$ 1.36	$ 0.47	$ 0.64	$ 0.73	$ 2.09	$ 3.18	$ 1.88
Earnings per common share — Diluted:
Income from continuing operations	$ 47,318	$ 43,335	$ 31,112	$ 34,810	$ 103,837	$ 36,332	$ 50,203	$ 57,547	$ 156,575	$ 247,919	$ 147,874
Income from continuing operations available to common shareholders — Diluted									$ 155,541	$ 246,402	$ 146,829
Weighted-average common shares outstanding — Basic									74,477,865	77,447,263	78,219,458
Effect of diluted shares(2)									(904,417)	(301,356)	(153,983)
Weighted-average common shares outstanding — Diluted									75,382,282	77,748,619	78,373,441
Net income per share (in dollars per share)	$ 0.62	$ 0.57	$ 0.41	$ 0.46	$ 1.35	$ 0.46	$ 0.64	$ 0.73	$ 2.06	$ 3.17	$ 1.87