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Supplemental Financial Information (Summary of Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]    
Product remediation liability $ 20,060 $ 23,464
Deferred compensation - Caisson acquisition 14,137 0
Legal and other administrative costs 7,863 6,184
Provisions for agents, returns and other 8,505 7,271
Restructuring related liabilities 5,098 16,859
Product warranty obligations 1,747 2,736
Royalty costs 2,048 2,503
Escrow indemnity liability - Caisson 2,000 0
Deferred income 4,752 0
Government grants 1,275 1,708
Derivative contract liabilities 3,055 942
Research and development costs 1,173 839
Other 20,499 13,061
Accrued liabilities $ 92,212 $ 75,567