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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 19, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative adjustment upon adoption of ASU No. 2016-01 |  |  | $ 0 |  |
Amounts reclassified from cumulative other comprehensive income to net income |  | $ 0 | (5,082) | $ (2,795) |
Restricted cash |  | 15,095 | 16,083 |  |
Net cash provided by (used in) operating activities |  | $ 392,840 | 419,304 | 424,481 |
Cumulative Other Comprehensive Income (Loss) |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative adjustment upon adoption of ASU No. 2016-01 |  |  | (87,429) |  |
Cumulative Other Comprehensive Income (Loss) | ASU 2016-01 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative adjustment upon adoption of ASU No. 2016-01 | $ (86,573) |  |  |  |
Amounts reclassified from cumulative other comprehensive income to net income | (841) |  |  |  |
Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative adjustment upon adoption of ASU No. 2016-01 |  |  | 87,429 |  |
Retained Earnings | ASU 2016-01 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative adjustment upon adoption of ASU No. 2016-01 | 86,573 |  |  |  |
Amounts reclassified from cumulative other comprehensive income to net income | $ 841 |  |  |  |
Restatement Adjustment | ASU 2016-18 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net cash provided by (used in) operating activities |  |  | $ 12,254 | $ (2,326) |
Scenario, Forecast | Minimum | ASU 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Right-of-use asset |  |  |  |  | $ 5,000
Lease liability |  |  |  |  | 5,000
Scenario, Forecast | Maximum | ASU 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Right-of-use asset |  |  |  |  | 7,000
Lease liability |  |  |  |  | $ 7,000

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