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Quarterly Financial Information (Details) - 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
Quarterly Financial Information
Revenues	$ 46,463	$ 47,119	$ 46,266	$ 45,456	$ 43,587	$ 41,776	$ 41,472	$ 41,810	$ 185,304	$ 168,645	$ 168,065
Net income available to common stockholders	$ 12,449	$ 27,080	$ 20,352	$ 20,254	$ 30,645	$ 34,782	$ 68,658	$ 20,271	$ 80,135	$ 154,356	$ 86,978
Net income per common share available to common stockholders:
Basic (in dollars per share)	$ 0.31	$ 0.68	$ 0.51	$ 0.51	$ 0.78	$ 0.88	$ 1.74	$ 0.51	$ 2.03	$ 3.91	$ 2.21
Diluted (in dollars per share)	0.31	0.68	0.51	0.51	0.77	0.88	1.73	0.51	2.02	3.89	2.20
Dividends declared and paid per common share (in dollars per share)	0.57	0.57	0.57	0.57	0.57	0.57	0.57	0.57
Dividends declared and paid per common share (in dollars per share)	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 2.280	$ 2.280	$ 2.280

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