Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Summary of Acquired Intangible Assets (Details)

v3.8.0.1
Intangible Assets - Summary of Acquired Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets    
Weighted Average Life 12 years  
Gross Carrying Amount $ 215,184 $ 215,043
Accumulated Amortization $ 67,592 61,550
Patents    
Finite-Lived Intangible Assets    
Weighted Average Life 11 years  
Gross Carrying Amount $ 2,146 2,146
Accumulated Amortization $ 1,651 1,629
Non-compete Agreement    
Finite-Lived Intangible Assets    
Weighted Average Life 4 years  
Gross Carrying Amount $ 10,900 10,900
Accumulated Amortization $ 2,435 1,687
Trade Names    
Finite-Lived Intangible Assets    
Weighted Average Life 10 years  
Gross Carrying Amount $ 11,516 11,492
Accumulated Amortization $ 4,381 4,114
Completed and Unpatented Technology    
Finite-Lived Intangible Assets    
Weighted Average Life 10 years  
Gross Carrying Amount $ 38,155 38,114
Accumulated Amortization 12,938 11,931
Backlog    
Finite-Lived Intangible Assets    
Gross Carrying Amount 14,424 14,424
Accumulated Amortization $ 13,864 12,184
Customer Relationships    
Finite-Lived Intangible Assets    
Weighted Average Life 15 years  
Gross Carrying Amount $ 138,043 137,967
Accumulated Amortization $ 32,323 $ 30,005
Maximum | Backlog    
Finite-Lived Intangible Assets    
Weighted Average Life 1 year