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Acquisition - Summary of Preliminary Estimated Fair Value of Intangible Assets Acquired and the Related Estimated Useful Lives (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Aug. 09, 2017
Jun. 30, 2018
Dec. 31, 2017
Trade names and trademarks—other      
Business Acquisition [Line Items]      
Useful Lives (in Years)   13 years 9 months 18 days  
Cambridge      
Business Acquisition [Line Items]      
Other intangible assets $ 271,793    
Cambridge | Banking Relationship      
Business Acquisition [Line Items]      
Useful Lives (in Years) 20 years    
Finite-lived intangible assets $ 705    
Cambridge | Customer relationships and other identifiable intangible assets      
Business Acquisition [Line Items]      
Useful Lives (in Years) 20 years    
Other intangible assets $ 41,749    
Cambridge | Technology      
Business Acquisition [Line Items]      
Useful Lives (in Years) 5 years    
Other intangible assets $ 16,039    
Cambridge | Customer Relationships      
Business Acquisition [Line Items]      
Other intangible assets $ 178,190    
Cambridge | Customer Relationships | Minimum      
Business Acquisition [Line Items]      
Useful Lives (in Years) 7 years    
Cambridge | Customer Relationships | Maximum      
Business Acquisition [Line Items]      
Useful Lives (in Years) 18 years    
Creative Lodging Solutions | Trade names and trademarks—other      
Business Acquisition [Line Items]      
Useful Lives (in Years)     1 year
Finite-lived intangible assets     $ 180
Creative Lodging Solutions | Customer relationships and other identifiable intangible assets      
Business Acquisition [Line Items]      
Finite-lived intangible assets     $ 53,459
Creative Lodging Solutions | Technology      
Business Acquisition [Line Items]      
Useful Lives (in Years)     4 years
Finite-lived intangible assets     $ 1,750
Creative Lodging Solutions | Customer Relationships      
Business Acquisition [Line Items]      
Useful Lives (in Years)     8 years
Finite-lived intangible assets     $ 51,529
Trade names and trademarks—indefinite lived | Cambridge      
Business Acquisition [Line Items]      
Customer relationships—Accounts Payable Solutions $ 35,110