Significant Accounting Policies (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	Dec. 31, 2015
Accounting Policies [Abstract]
Restricted cash	$ 119,574	$ 131,367	$ 119,574	$ 131,367	$ 131,442	$ 111,300
Accounting Policies [Line Items]
Property management expenses	$ 17,447	18,335	$ 52,367	53,177
Restatement Adjustment | Reclassification of Noncash Share-based Compensation to Property Management Expenses and General and Administrative Expense
Accounting Policies [Line Items]
Non-cash share based compensation expense		900		2,700
Restatement Adjustment | Reclassification of Noncash Share-based Compensation to Property Management Expenses
Accounting Policies [Line Items]
Non-cash share based compensation expense		400		1,100
Restatement Adjustment | Reclassification of Noncash Share-based Compensation to General and Administrative Expenses
Accounting Policies [Line Items]
Non-cash share based compensation expense		500		1,600
Restatement Adjustment | Reclassification of Property Management Expenses
Accounting Policies [Line Items]
Property management expenses		$ 17,900		$ 52,000