Debt - Deferred Financing Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Financing costs	$ 35,365	$ 25,315
Less: accumulated amortization	(17,998)	(13,863)
Total deferred financing costs, net	17,367	11,452
Amortization of financing costs	4,100	3,800	$ 4,100
Revolving Credit Facility | Unsecured revolving credit facility
Debt Instrument [Line Items]
Net deferred financing costs	$ 2,100	$ 4,200