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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reclassification from accumulated other comprehensive income |  | $ 0 | $ 0 | $ 0 | $ (5,082)
Restricted cash |  | $ 108,335 | 14,088 | 108,335 | 14,088
Net cash provided by operating activities |  |  |  | $ 286,022 | $ 334,649
AOCI Attributable to Parent | Accounting Standards Update 2016-01 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect from other comprehensive income to retained earnings | $ (86,572) |  |  |  |
Reclassification from accumulated other comprehensive income | (841) |  |  |  |
Retained Earnings | Accounting Standards Update 2016-01 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect from other comprehensive income to retained earnings | 86,572 |  |  |  |
Reclassification from accumulated other comprehensive income | $ 841 |  |  |  |
Restatement Adjustment | Accounting Standards Update 2016-18 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net cash provided by operating activities |  |  | $ 10,259 |  |

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