Summary of Significant Accounting Policies Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Other Current Assets [Line Items]
Document Fiscal Year Focus	2017
Goodwill	$ 331,884	$ 0
Investments	41,636	36,008
Prepaid Expense and Other Assets	30,332
Prepaid Expense and Other Assets, Current		10,386
Derivative Asset	14,515	11,622
Property, Plant and Equipment, Net	6,123	4,094
Debt Issuance Costs, Net	2,637
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net		3,557
Parent Company [Member]
Other Current Assets [Line Items]
Other Assets	$ 427,127	$ 65,667