Debt - Deferred Financing Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Financing costs	$ 23,145	$ 20,882
Less: accumulated amortization	(12,241)	(7,972)
Total deferred financing costs, net	10,904	12,910
Amortization of financing costs	5,000	$ 6,100	$ 7,600
Revolving credit facility [Member] | Unsecured revolving credit facility [Member]
Debt Instrument [Line Items]
Net deferred financing costs	$ 4,500