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Revenue Recognition - Impact on Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Prepaid expenses and other current assets | $ 27,687 | $ 30,683
Accrued income taxes | 8,974 | 11,503
Deferred revenue and customer deposits | 13,252 | 9,420
Retained earnings | $ 670,935 | 668,587
As previously reported |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Prepaid expenses and other current assets |  | 30,800
Accrued income taxes |  | 11,391
Deferred revenue and customer deposits |  | 9,969
Retained earnings |  | 668,267
Adjustment | Accounting Standards Update 2014-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Prepaid expenses and other current assets |  | (117)
Accrued income taxes |  | 112
Deferred revenue and customer deposits |  | (549)
Retained earnings |  | $ 320

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