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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
Property, Plant and Equipment [Line Items] |  |  |  |
Cash outflow from operations | $ 156,608 | $ 152,702 | $ 201,667 |
Cash outflow from financing activities | 135,066 | (66,948) | (36,095) |
Excess tax benefit, amount |  | 8,400 |  |
Accounting Standards Update 2016-15 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cash outflow from operations |  | 2,400 | 1,700 |
Cash outflow from financing activities |  | (2,400) | (1,700) |
Selling, General and Administrative Expenses |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Shipping, and handling costs | $ 83,200 | $ 68,600 | $ 51,800 |
Minimum | Accounting Standards Update 2016-02 | Forecast |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Right-of-use asset |  |  |  | $ 65,000
Operating lease, liability |  |  |  | 60,000
Maximum | Accounting Standards Update 2016-02 | Forecast |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Right-of-use asset |  |  |  | 75,000
Operating lease, liability |  |  |  | $ 75,000

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