Debt - Deferred Financing Costs, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Financing costs	$ 23,333		$ 23,333		$ 23,145
Less: accumulated amortization	(6,004)		(6,004)		(12,241)
Total deferred financing costs, net	17,329		17,329		10,904
Amortization of deferred financing costs	1,000	$ 1,300	3,600	$ 3,700
Unsecured term loan facility | Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Net deferred financing costs	$ 8,700		$ 8,700		$ 4,500