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Nature of Operations and Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Long-term deferred income taxes payable | $ 419,020 | $ 565,404
Retained Earnings (Accumulated Deficit) | 1,516,957 | 1,103,751
Accounting Standards Update 2016-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net deferred tax liabilities | 900 |
Retained Earnings (Accumulated Deficit) | 900 |
Income tax benefit | $ 5,400 |
Scenario, adjustment | Accounting Standards Update 2015-07 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net deferred tax liabilities |  | 129,300
Long-term deferred income taxes payable |  | $ (129,300)

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