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Assets - Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Goodwill    
Gross carrying amount, beginning balance $ 238,108  
Accumulated impairment, beginning balance 123,200  
Net amount, beginning balance 114,908  
Acquisition 193,621  
Gross carrying amount, ending balance 431,729  
Accumulated impairment, ending balance 123,200  
Net amount, ending balance 308,529  
Intangible assets    
Accumulated Amortization and Impairment 166,523 $ 146,221
Gross Carrying Amount 550,119 204,599
Total Net Intangible Assets $ 383,596 58,378
Weighted Average Remaining Amortization Period 9 years  
Indefinite-lived trademark    
Intangible assets    
Indefinite-lived intangible assets $ 2,900 2,900
Technology    
Intangible assets    
Gross Carrying Amount 307,588 149,198
Accumulated Amortization and Impairment 125,154 113,904
Net Amount $ 182,434 35,294
Weighted Average Remaining Amortization Period 7 years 6 months  
Customer relationships    
Intangible assets    
Gross Carrying Amount $ 164,595 47,885
Accumulated Amortization and Impairment 35,653 28,659
Net Amount $ 128,942 19,226
Weighted Average Remaining Amortization Period 11 years 7 months 6 days  
In-process research and development    
Intangible assets    
Gross Carrying Amount $ 43,340  
Net Amount 43,340  
Trademark and tradenames    
Intangible assets    
Gross Carrying Amount 28,010 2,590
Accumulated Amortization and Impairment 3,272 1,948
Net Amount $ 24,738 642
Weighted Average Remaining Amortization Period 6 years 7 months 6 days  
Other    
Intangible assets    
Gross Carrying Amount $ 3,686 2,026
Accumulated Amortization and Impairment 2,444 1,710
Net Amount $ 1,242 $ 316
Weighted Average Remaining Amortization Period 6 months