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Recent Accounting Standards - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Change in tax rate, deferred tax asset, provisional income tax expense | $ 1,700 |  |
Transition tax for accumulated foreign earnings, provisional liability | 12,000 |  |
Increase to retained earnings | 684,540 |  | $ 591,349
Accounting Standards Update 2016-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred tax asset, adjustment |  |  | $ 12,700
Forecast |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase to retained earnings |  | $ 4,000 |
Interest rate swap | Accounting Standards Update 2017-12 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect on retained earnings | $ 200 |  |

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