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Equity - Class of Stock Disclosures - Dividends and AOCI (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended																																					3 Months Ended								12 Months Ended
	Jan. 31, 2018	Dec. 31, 2017	Nov. 30, 2017	Oct. 31, 2017	Sep. 30, 2017	Aug. 31, 2017	Jul. 31, 2017	Jun. 30, 2017	May 31, 2017	Apr. 30, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Dec. 31, 2016	Nov. 30, 2016	Oct. 31, 2016	Sep. 30, 2016	Aug. 31, 2016	Jul. 31, 2016	Jun. 30, 2016	May 31, 2016	Apr. 30, 2016	Mar. 31, 2016	Feb. 29, 2016	Jan. 31, 2016	Dec. 31, 2015	Nov. 30, 2015	Oct. 31, 2015	Sep. 30, 2015	Aug. 31, 2015	Jul. 31, 2015	Jun. 30, 2015	May 31, 2015	Apr. 30, 2015	Mar. 31, 2015	Feb. 28, 2015	Jan. 31, 2015	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Dividend Distributions
Declared		$ 90,219												$ 84,568												$ 76,765												$ 90,219				$ 84,568				$ 90,219	$ 84,568	$ 76,765
Paid																																														$ 90,219	$ 84,568	$ 76,765
Dividends per share declared (in dollars per share)																																						$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.54	$ 0.54	$ 0.54
Dividends paid per common share (in dollars per share)																																						$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.54	$ 0.54	$ 0.54	$ 2.28	$ 2.19	$ 2.07
Accumulated other comprehensive income
Accumulated other comprehensive income		0												0																								$ 0				$ 0				$ 0	$ 0
Subsequent Event \| Dividend Payable, January 31, 2018
Dividend Distributions
Dividends per share declared (in dollars per share)	$ 0.19
Dividends Payable, Date to be Paid	Jan. 31, 2018
Dividends Payable, Date of Record	Jan. 23, 2018
Subsequent Event \| Dividend Payable, February 28, 2018
Dividend Distributions
Dividends per share declared (in dollars per share)	$ 0.19
Dividends Payable, Date to be Paid	Feb. 28, 2018
Dividends Payable, Date of Record	Feb. 20, 2018
Subsequent Event \| Dividend Payable, March 30, 2018
Dividend Distributions
Dividends per share declared (in dollars per share)	$ 0.19
Dividends Payable, Date to be Paid	Mar. 30, 2018
Dividends Payable, Date of Record	Mar. 22, 2018
Common Stock
Dividend Distributions
Declared		$ 90,219												$ 84,568												$ 74,311												$ 90,219				$ 84,568				90,219	84,568	$ 74,311
Paid																																														$ 90,219	$ 84,568	74,311
Dividends per share declared (in dollars per share)		$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.17
Dividends paid per common share (in dollars per share)		$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.17
Series C Preferred Stock
Dividend Distributions
Declared																										$ 2,454																						2,454
Paid																																																$ 2,454