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Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Other Intangible Assets          
Gross Carrying Amount $ 121,302   $ 121,302   $ 121,302
Accumulated Amortization (57,745)   (57,745)   (54,359)
Total amortization expense 63,557   63,557   66,943
Amortization expense 1,704 $ 1,613 3,424 $ 3,149  
Customer lists/relationships          
Other Intangible Assets          
Gross Carrying Amount 64,323   64,323   64,323
Accumulated Amortization (35,387)   (35,387)   (33,685)
Total amortization expense 28,936   28,936   30,638
Patents          
Other Intangible Assets          
Gross Carrying Amount 10,319   10,319   10,319
Accumulated Amortization (10,319)   (10,319)   (10,319)
Total amortization expense 0   0   0
Technology and other intangibles          
Other Intangible Assets          
Gross Carrying Amount 44,460   44,460   44,460
Accumulated Amortization (12,039)   (12,039)   (10,355)
Total amortization expense 32,421   32,421   34,105
In process research and development          
Other Intangible Assets          
Gross Carrying Amount         2,200
Total amortization expense 2,200   2,200   $ 2,200
Indefinite-Lived Intangible Assets (Excluding Goodwill) $ 2,200   $ 2,200