Additional Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in operating assets and liabilities, net of effect of businesses acquired [Abstract]
Accounts receivable	$ (62,433)	$ (51,152)	$ (4,120)
Inventories	(80,182)	(55,062)	13,760
Prepaid expenses and other current assets	(11,670)	(3,668)	(12,180)
Accounts payable	(2,277)	42,291	17,839
Other current liabilities	54,745	21,184	(19,505)
Net change in operating assets and liabilities	$ (101,817)	$ (46,407)	$ (4,206)