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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
New Accounting Pronouncement, Early Adoption |  |
Adjustment to retained earnings | $ (9,144) |
Decrease in retained earnings | (1,006,500) | $ (1,423,154)
Accounting Standards Update 2016-16 |  |
New Accounting Pronouncement, Early Adoption |  |
Adjustment to retained earnings | (34,132) |
Decrease in deferred tax asset | 34,100 |
Accounting Standards Update 2016-01 |  |
New Accounting Pronouncement, Early Adoption |  |
Adjustment to retained earnings | $ 9,144 |

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