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Description of Business and Summary of Significant Accounting Policies (Goodwill) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Business Combination Segment Allocation [Line Items]    
Document Period End Date Jun. 30, 2016  
Goodwill [Roll Forward]    
Beginning Balance $ 402,259 $ 402,220
Additions, net 0 8,868
Goodwill, Purchase Accounting Adjustments 4,298 (2,099)
Goodwill, Transfers 0 (1,783)
Foreign currency translation adjustments 389 (4,947)
Ending Balance $ 406,946 $ 402,259