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Goodwill and Intangibles - Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Intangible assets            
Amortization expense $ 36,900 $ 43,100 $ 28,300      
Intangible assets:            
Cost 275,320 272,144        
Accumulated Amortization (143,153) (109,176)        
Net 132,167 162,968   $ 186,165 $ 194,391 $ 204,361
Impairment charges on long lived assets 1,000 11,100 $ 0      
Technology            
Intangible assets:            
Cost 124,799 129,382        
Accumulated Amortization (70,608) (53,142)        
Net 54,191 76,240        
Customer lists and relationships            
Intangible assets:            
Cost 128,170 129,650        
Accumulated Amortization (62,905) (49,852)        
Net 65,265 79,798        
Capitalized software and patents            
Intangible assets:            
Cost 19,792 10,589        
Accumulated Amortization (7,115) (3,923)        
Net 12,677 6,666        
Trade name            
Intangible assets:            
Cost 2,559 2,523        
Accumulated Amortization (2,525) (2,259)        
Net $ 34 $ 264