Stockholders' Equity - Equity Transactions (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands							1 Months Ended		2 Months Ended	4 Months Ended		6 Months Ended	7 Months Ended		12 Months Ended
	Jun. 19, 2019	Feb. 27, 2019	Jan. 17, 2019	Jan. 11, 2019	Dec. 19, 2018	Jun. 30, 2017	Jan. 26, 2018	Oct. 06, 2017	Jun. 03, 2019	Dec. 10, 2018	Dec. 30, 2017	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Proceeds from issuance of common stock															$ 49,795	$ 2,632
Common stock repurchased (in shares)									250				750
Payments for common stock repurchased															$ (16,965)	0	$ 0
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock issued (in shares)	100						107	619		840	612	1,914
Per Share price (in dollars per share)	$ 24.81						$ 24.62	$ 26.44		$ 22.61	$ 24.44	$ 24.74	$ 24.74	$ 24.74	$ 24.74
Proceeds from issuance of preferred stock, net	$ 2,489						$ 2,632	$ 16,500		$ 19,001	$ 14,968	$ 47,306			$ 44,289	$ 2,632	14,815
Proceeds from issuance of common stock																	$ 14,968
Common Stock
Class of Stock [Line Items]
Per Share price (in dollars per share)		$ 19.98	$ 20.00	$ 20.98	$ 21.53	$ 25.96						$ 17.77	$ 17.77	$ 17.77	$ 17.77
Common stock issued (in shares)		8,280	6,900	884	883	4,500
Proceeds from issuance of common stock		$ 165,374	$ 137,946	$ 18,540	$ 19,013	$ 116,693
Common stock repurchased (in shares)														1,000
Payments for common stock repurchased														$ (17,768)