Stockholders' Equity - Schedule of Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
	Jan. 01, 2019	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
Class of Stock [Line Items]
Common stock dividend declared (in USD per share)		$ 0.50	$ 0.45	$ 0.45	$ 0.45	$ 0.42	$ 0.42	$ 0.42	$ 0.42	$ 1.850000	$ 1.680000
Dividends, common stock		$ 72,132	$ 64,261	$ 57,958	$ 57,720	$ 46,866	$ 46,895	$ 46,890	$ 46,887
Ordinary Dividends
Class of Stock [Line Items]
Common stock dividend declared (in USD per share)										0	1.378178
Return of Capital
Class of Stock [Line Items]
Common stock dividend declared (in USD per share)										1.350000	0
Capital Gain Distribution
Class of Stock [Line Items]
Common stock dividend declared (in USD per share)										0	0
Carry Forward
Class of Stock [Line Items]
Common stock dividend declared (in USD per share)										0.500000	0.301822
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)	$ 0.4844	$ 0.4844	$ 0.4844	$ 0.4844	$ 0.4844		$ 0.4844	$ 0.4844	$ 0.4844	1.937600	1.937600
Dividends, preferred stock		$ 2,712	$ 2,713	$ 2,712	$ 2,713	$ 2,713	$ 2,713	$ 2,712	$ 2,713
Series A Preferred Stock | Ordinary Dividends
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)										0	1.937600
Series A Preferred Stock | Return of Capital
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)										1.937600	0
Series A Preferred Stock | Capital Gain Distribution
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)										0	0
Series A Preferred Stock | Carry Forward
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)										0	0
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)		$ 0.4844	$ 0.4844	$ 0.4844	$ 0.4844	$ 0.4844	$ 0.4844	$ 0.4844	$ 0.4844	1.937600	1.937600
Dividends, preferred stock		$ 3,003	$ 3,003	$ 3,004	$ 3,003	$ 3,003	$ 3,003	$ 3,004	$ 3,003
Series B Preferred Stock | Ordinary Dividends
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)										0	1.937600
Series B Preferred Stock | Return of Capital
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)										1.937600	0
Series B Preferred Stock | Capital Gain Distribution
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)										0	0
Series B Preferred Stock | Carry Forward
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)										0	0
Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)		$ 0.46875	$ 0.46875	$ 0.46875	$ 0.46875	$ 0.46875	$ 0.46875	$ 0.46875	$ 0.46875	1.875000	1.875000
Dividends, preferred stock		$ 5,391	$ 5,391	$ 5,390	$ 5,391	$ 5,391	$ 5,391	$ 5,390	$ 5,391
Series C Preferred Stock | Ordinary Dividends
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)										0	1.875000
Series C Preferred Stock | Return of Capital
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)										1.875000	0
Series C Preferred Stock | Capital Gain Distribution
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)										0	0
Series C Preferred Stock | Carry Forward
Class of Stock [Line Items]
Preferred stock dividend declared (in USD per share)										$ 0	$ 0