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