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Goodwill and Intangible Assets - Intangible Assets, Net (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]    
Accumulated amortization $ (85,840) $ (80,030)
Foreign currency exchange rate fluctuations 567 107
Total intangibles assets, gross carrying amount 247,731 248,030
Total intangible assets, net carrying amount 162,458 168,107
In-process technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Accumulated amortization 0 0
Foreign currency exchange rate fluctuations 0 0
Indefinite-lived intangible assets 3,900 3,900
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 133,950 133,913
Accumulated amortization (36,356) (33,526)
Foreign currency exchange rate fluctuations 314 65
Net carrying amount $ 97,908 $ 100,452
Customer relationships | Minimum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 1 year 1 year
Customer relationships | Maximum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 30 years 30 years
Acquired technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 74,371 $ 74,593
Accumulated amortization (23,359) (21,523)
Foreign currency exchange rate fluctuations 203 34
Net carrying amount $ 51,215 $ 53,104
Acquired technology | Minimum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 3 years 3 years
Acquired technology | Maximum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 20 years 20 years
Backlog    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 21,712 $ 21,712
Accumulated amortization (18,424) (17,544)
Foreign currency exchange rate fluctuations 0 0
Net carrying amount $ 3,288 $ 4,168
Backlog | Minimum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 1 year 1 year
Backlog | Maximum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 4 years 5 years
Trade names    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 8,662 $ 8,716
Accumulated amortization (4,861) (4,719)
Foreign currency exchange rate fluctuations 38 6
Net carrying amount $ 3,839 $ 4,003
Trade names | Minimum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 1 year 1 year
Trade names | Maximum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 12 years 12 years
Patents    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 3,236 $ 3,296
Accumulated amortization (1,390) (1,418)
Foreign currency exchange rate fluctuations 12 2
Net carrying amount $ 1,858 $ 1,880
Patents | Minimum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 2 years 2 years
Patents | Maximum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 20 years 20 years
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 1,900 $ 1,900
Accumulated amortization (1,450) (1,300)
Foreign currency exchange rate fluctuations 0 0
Net carrying amount $ 450 $ 600
Useful life (in years) 3 years 3 years