Equity - Dividends and Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands											12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 31, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Partial dividend paid, per common share (in USD per share)	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105	$ 0.105
Payments of ordinary dividends, common stock											$ 37,181	$ 75,192	$ 70,854
Distributions paid to OP unitholders											23,700	50,800	54,700
Private perpetual preferred unit distributions											$ 4,197	$ 1,743	$ 936
Dividends per share (in USD per share)											$ 0.21	$ 0.42	$ 0.42
Dividends paid, percent taxable as ordinary dividends											100.00%	31.40%	83.80%
Dividends paid, percent taxable as return of capital											0.00%	68.60%	16.20%