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Business Acquisitions Business Acquisitions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 03, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Net cash paid to acquire Archway   $ 80,234 $ 0 $ 0
Net assets acquired based on fair values:        
Property and equipment $ 776      
Goodwill   52,990 0  
Amortization of intangible assets   48,275 $ 45,392 $ 42,630
Estimated amortization expense related to Archway intangible assets in 2018   43,717    
Estimated amortization expense related to Archway intangible assets in 2019   43,717    
Estimated amortization expense related to Archway intangible assets in 2020   43,717    
Estimated amortization expense related to Archway intangible assets in 2021   43,439    
Estimated amortization expense related to Archway intangible assets in 2022   29,556    
Archway [Member]        
Business Acquisition [Line Items]        
Total purchase price 81,635      
Maximum contingent purchase price 8,000      
Contingent consideration 4,800      
Net adjustment to contingent consideration   3,800    
Cash acquired during transaction 1,401      
Net cash paid to acquire Archway 80,234      
Escrow account balance   8,000    
Net assets acquired based on fair values:        
Current assets, net 2,539      
Goodwill 52,990      
Contingent consideration (4,800)      
Total purchase price allocation 81,635      
Amortization of intangible assets   1,552    
Estimated amortization expense related to Archway intangible assets in 2018   3,104    
Estimated amortization expense related to Archway intangible assets in 2019   3,104    
Estimated amortization expense related to Archway intangible assets in 2020   3,104    
Estimated amortization expense related to Archway intangible assets in 2021   3,104    
Estimated amortization expense related to Archway intangible assets in 2022   $ 2,757    
Acquired technology [Member] | Archway [Member]        
Net assets acquired based on fair values:        
Intangible assets $ 13,510      
Weighted average useful life of acquired intangible assets 10 years      
Client relationships [Member] | Archway [Member]        
Net assets acquired based on fair values:        
Intangible assets $ 10,760      
Weighted average useful life of acquired intangible assets 15 years      
Non-competition agreements [Member] | Archway [Member]        
Net assets acquired based on fair values:        
Intangible assets $ 3,470      
Weighted average useful life of acquired intangible assets 5 years      
Trade names [Member] | Archway [Member]        
Net assets acquired based on fair values:        
Intangible assets $ 2,390      
Weighted average useful life of acquired intangible assets 7 years