Dividends and Distributions - Summary of Dividends Declared and Distributions Paid (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended																		2 Months Ended				10 Months Ended	12 Months Ended			13 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jan. 31, 2018	Dec. 31, 2017	Oct. 31, 2017	Sep. 30, 2017	Jul. 31, 2017	Jun. 30, 2017	Apr. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Oct. 31, 2016	Sep. 30, 2016	Jul. 31, 2016	Jun. 30, 2016	Apr. 30, 2016	Mar. 31, 2016	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Oct. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 31, 2019
Dividends Payable [Line Items]
Dividend Per Share (in usd per share)																								$ 0.74	$ 0.29	$ 0.29
Participating Dividend
Dividends Payable [Line Items]
Dividend Per Share (in usd per share)				$ 0.0186	$ 0.073		$ 0.073		$ 0.073		$ 0.073	$ 0.073		$ 0.073		$ 0.073		$ 0.073		$ 0.1875	$ 0.1875	$ 0.1396
Common Shares
Distributions Declared	$ 28,100	$ 27,300	$ 20,100	$ 1,291																$ 28,072	$ 27,250	$ 20,145
Distributions Paid				1,291																28,072	27,246	20,145
Distributions Paid
Distributions Declared				619	$ 5,054	$ 5,053		$ 5,054		$ 5,053		$ 5,054	$ 5,053		$ 5,054		$ 5,053			0	0	0			$ 20,214	$ 20,214
Series B Preferred Shares - Fixed Dividend
Distributions Paid
Distributions Declared				1,198
Restricted Stock Units, Expected to Vest | Participating Dividend
Common Shares
Distributions Paid		114	79																				$ 114
Restricted Stock Units, Not Expected to Vest | Participating Dividend
Common Shares
Distributions Paid																				28	28	20
Subsequent Event | Participating Dividend
Dividends Payable [Line Items]
Dividend Per Share (in usd per share)																			$ 0.1875
Common Shares
Distributions Declared																			$ 28,218								$ 104,976
Distributions Paid																			0
Distributions Paid
Distributions Declared																			0
Subsequent Event | Series B Preferred Shares - Fixed Dividend
Distributions Paid
Distributions Declared																											1,817
Subsequent Event | Restricted Stock Units, Not Expected to Vest | Participating Dividend
Common Shares
Distributions Paid																											76,523
Series A Preferred Shares | Series B Preferred Shares - Fixed Dividend
Distributions Paid
Distributions Paid																								$ 1	16	16
Series B Preferred Shares
Distributions Paid
Distributions Paid																									28,436	28,436
Series B Preferred Shares | Participating Dividend
Distributions Paid
Distributions Paid				619	$ 2,422	$ 2,421		$ 2,422		$ 2,421		$ 2,422	$ 2,421		$ 2,422		$ 2,421				0				9,686	9,686
Series B Preferred Shares | Series B Preferred Shares - Fixed Dividend
Distributions Paid
Distributions Paid				$ 1,198																					$ 18,750	$ 18,750
Series B Preferred Shares | Restricted Stock Units, Expected to Vest | Participating Dividend
Distributions Paid
Distributions Paid		$ 0	$ 0																				$ 0
Series B Preferred Shares | Restricted Stock Units, Not Expected to Vest | Participating Dividend
Distributions Paid
Distributions Paid																				$ 0	$ 0	$ 0
Series B Preferred Shares | Subsequent Event | Participating Dividend
Distributions Paid
Distributions Paid																			$ 0
Series B Preferred Shares | Subsequent Event | Series B Preferred Shares - Fixed Dividend
Distributions Paid
Distributions Paid																											$ 1,817