Acquisitions Business Combinations Purchase Accounting Assets Liabilities (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2018	Apr. 02, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			$ 12,400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables			97,514
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets			8,568
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			28,977
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets			194,850
Goodwill		$ 1,420,636	527,388	$ 894,095
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets			1,282
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			870,979
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities			93,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities			4,425
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			98,325
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	[1]		$ 772,654
Goodwill, Purchase Accounting Adjustments		1,000
Liabilities Assumed		$ 15,700

[1] This amount represents the $775.0 million in purchase consideration as set forth in the purchase agreement, plus $12.4 million paid for cash acquired and $1.0 million paid for working capital delivered in excess of target working capital, less $15.7 million indebtedness assumed