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Assets - Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 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 188,252  
Gross carrying Amount, ending balance 426,360  
Accumulated Impairment, ending balance 123,200  
Net Amount, ending balance 303,160  
Intangible assets    
Accumulated Amortization and Impairment 154,164 $ 146,221
Total Gross Intangible Assets 550,261 204,599
Total Net Intangible Assets 396,097 58,378
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 118,863 113,904
Net Amount 188,725 35,294
Customer relationships    
Intangible assets    
Gross Carrying Amount 164,595 47,885
Accumulated Amortization and Impairment 31,971 28,659
Net Amount 132,624 19,226
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 2,326 1,948
Net Amount 25,684 642
Other    
Intangible assets    
Gross Carrying Amount 3,828 2,026
Accumulated Amortization and Impairment 1,004 1,710
Net Amount $ 2,824 $ 316