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Goodwill and Intangible Assets - Intangible Assets, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Intangible Assets [Line Items]    
Accumulated amortization $ (84,416) $ (102,687)
Foreign currency exchange rate fluctuations (1,106) (1,122)
Total intangibles assets, gross carrying amount 224,415 247,495
Total intangible assets, net carrying amount 138,893 143,686
Customer relationships    
Intangible Assets [Line Items]    
Gross carrying amount 135,234 135,234
Accumulated amortization (47,557) (45,029)
Foreign currency exchange rate fluctuations (1,127) (1,185)
Total $ 86,550 $ 89,020
Customer relationships | Minimum    
Intangible Assets [Line Items]    
Useful life (in years) 1 year 1 year
Customer relationships | Maximum    
Intangible Assets [Line Items]    
Useful life (in years) 30 years 30 years
Acquired technology    
Intangible Assets [Line Items]    
Gross carrying amount $ 77,142 $ 78,122
Accumulated amortization (30,239) (29,206)
Foreign currency exchange rate fluctuations 8 42
Total $ 46,911 $ 48,958
Acquired technology | Minimum    
Intangible Assets [Line Items]    
Useful life (in years) 3 years 3 years
Acquired technology | Maximum    
Intangible Assets [Line Items]    
Useful life (in years) 20 years 20 years
Backlog    
Intangible Assets [Line Items]    
Gross carrying amount $ 1,150 $ 21,350
Accumulated amortization (575) (20,703)
Foreign currency exchange rate fluctuations 0 0
Total $ 575 $ 647
Backlog | Minimum    
Intangible Assets [Line Items]    
Useful life (in years) 1 year 1 year
Backlog | Maximum    
Intangible Assets [Line Items]    
Useful life (in years) 4 years 4 years
Trade names    
Intangible Assets [Line Items]    
Gross carrying amount $ 7,650 $ 7,650
Accumulated amortization (4,530) (4,361)
Foreign currency exchange rate fluctuations 11 17
Total $ 3,131 $ 3,306
Trade names | Minimum    
Intangible Assets [Line Items]    
Useful life (in years) 1 year 1 year
Trade names | Maximum    
Intangible Assets [Line Items]    
Useful life (in years) 12 years 12 years
Patents    
Intangible Assets [Line Items]    
Gross carrying amount $ 3,239 $ 3,239
Accumulated amortization (1,515) (1,488)
Foreign currency exchange rate fluctuations 2 4
Total $ 1,726 $ 1,755
Patents | Minimum    
Intangible Assets [Line Items]    
Useful life (in years) 2 years 2 years
Patents | Maximum    
Intangible Assets [Line Items]    
Useful life (in years) 20 years 20 years
Non-compete agreements    
Intangible Assets [Line Items]    
Gross carrying amount   $ 1,900
Accumulated amortization   (1,900)
Foreign currency exchange rate fluctuations   0
Total   $ 0
Useful life (in years) 3 years 3 years