Acquisitions - Pro Forma Information Adjustments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income	$ 63,933
Amortization
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income	1,902
Transaction costs
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income	9,976
Amortization of inventory step-up
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income	17,896
Stock compensation
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income	4,479
Income tax impact of above items
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income	$ (7,701)