Summary of Significant Accounting Policies Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Current Assets [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 0	$ 9,737	$ 0
Document Fiscal Year Focus	2018
Goodwill	$ 314,143	331,884	$ 0
Investments	41,287	41,636
Derivative Asset	17,482	14,515
Parent Company [Member]
Other Current Assets [Line Items]
Other Assets	$ 403,827	$ 427,127