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Acquisitions - Abacus (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jul. 01, 2015
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]          
Net cash consideration     $ 442,344 $ 31,799 $ 30,200
Acquisition related costs     14,437 0 0
Gain on remeasurement of previously-held joint venture interest     78,082 0 0
Restructuring charges     $ 9,256 10,470 $ 27,921
Abacus          
Business Acquisition [Line Items]          
Ownership percentage acquired 65.00%        
Ownership percentage 35.00%        
Ownership percentage before acquisition 35.00% 35.00% 35.00%    
Gain on remeasurement of previously-held joint venture interest     $ 78,000    
Gain on settlement     12,000    
Abacus | Consortium of Airlines          
Business Acquisition [Line Items]          
Ownership percentage acquired 65.00%        
Ownership percentage 65.00%        
Abacus          
Business Acquisition [Line Items]          
Net cash consideration $ 442,000        
Acquisition related costs     14,000 $ 4,000  
Restructuring charges     9,000    
Restructuring charges paid   $ 1,000      
Abacus | Revolving Credit Facility          
Business Acquisition [Line Items]          
Draw on revolving credit facility $ 70,000        
Data Processing Services | Abacus          
Business Acquisition [Line Items]          
Gain on settlement     $ 12,000