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Goodwill and Intangible Assets Intangibles Table (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 173,970 $ 173,372
Finite-Lived Intangible Assets, Accumulated Amortization 52,186 48,186
Finite-Lived Intangible Assets, Net 121,784 125,186
Indefinite-lived Intangible Assets (Excluding Goodwill) 9,269 8,235
Intangible Assets, Gross (Excluding Goodwill) 183,239 181,607
INTANGIBLE ASSETS, net $ 131,053 $ 133,421 [1]
Patents [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 10 years 10 years
Finite-Lived Intangible Assets, Gross $ 20,314 $ 19,399
Finite-Lived Intangible Assets, Accumulated Amortization 12,475 12,147
Finite-Lived Intangible Assets, Net $ 7,839 $ 7,252
Customer Contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 9 years 9 years
Finite-Lived Intangible Assets, Gross $ 5,319 $ 5,319
Finite-Lived Intangible Assets, Accumulated Amortization 5,319 5,272
Finite-Lived Intangible Assets, Net $ 0 $ 47
Customer-Related Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 9 years 9 years
Finite-Lived Intangible Assets, Gross $ 57,949 $ 57,916
Finite-Lived Intangible Assets, Accumulated Amortization 15,080 13,363
Finite-Lived Intangible Assets, Net $ 42,869 $ 44,553
Trademarks [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 4 years 4 years
Finite-Lived Intangible Assets, Gross $ 425 $ 425
Finite-Lived Intangible Assets, Accumulated Amortization 425 425
Finite-Lived Intangible Assets, Net $ 0 $ 0
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 15 years 15 years
Finite-Lived Intangible Assets, Gross $ 7,456 $ 7,456
Finite-Lived Intangible Assets, Accumulated Amortization 1,747 1,618
Finite-Lived Intangible Assets, Net $ 5,709 $ 5,838
Developed Technology Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 11 years 11 years
Finite-Lived Intangible Assets, Gross $ 82,507 $ 82,857
Finite-Lived Intangible Assets, Accumulated Amortization 17,140 15,361
Finite-Lived Intangible Assets, Net $ 65,367 $ 67,496
[1] December 31, 2018 balances were derived from audited consolidated financial statements.