Property and Equipment Property and Equipment (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 50,373	$ 53,214	$ 47,959
Depreciation expense, cost of goods sold	10,700	10,200	9,500
Impairment of assets	$ 0	435	11,928
Technology Equipment, Enterprise Resource Planning System [Member]
Property, Plant and Equipment [Line Items]
Impairment of assets			$ 11,900
Contractual payments due subsequent to the cease use date		2,100
Acceleration of expense recognition of unamortized prepaid costs		700
Merger And Integration Costs [Member] | Technology Equipment, Enterprise Resource Planning System [Member]
Property, Plant and Equipment [Line Items]
Integration related costs		$ 2,800