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Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Other Intangible Assets, gross:    
Other Intangible Assets, gross $ 634,831 $ 632,844
Total Accumulated Amortization (306,214) (280,807)
Other Intangible Assets, net 328,617 352,037 [1]
Patents    
Other Intangible Assets, gross:    
Other Intangible Assets, gross 22,496 22,509
Total Accumulated Amortization (10,604) (9,539)
Customer lists    
Other Intangible Assets, gross:    
Other Intangible Assets, gross 550,003 548,038
Total Accumulated Amortization (268,123) (246,946)
Trade names    
Other Intangible Assets, gross:    
Other Intangible Assets, gross 31,166 31,174
Total Accumulated Amortization (8,810) (7,413)
Proprietary technology    
Other Intangible Assets, gross:    
Other Intangible Assets, gross 28,755 28,748
Total Accumulated Amortization (17,077) (15,400)
Land use rights    
Other Intangible Assets, gross:    
Other Intangible Assets, gross 284 282
Total Accumulated Amortization (50) (48)
Other    
Other Intangible Assets, gross:    
Other Intangible Assets, gross 2,127 2,093
Total Accumulated Amortization $ (1,550) $ (1,461)
[1] The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America.