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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 |  |

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