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Restructuring Charges (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Company's accrual for restructuring activities:-      
Beginning Restructuring Accrual Balance, as of December 31, 2015 $ 7,972    
Restructuring Charges 1,523 $ 4,413 $ 4,400
Restructuring Cash Payments (3,692)    
Impact of foreign currency on restructuring reserve (60)    
Ending Restructuring Accrual Balance, as of March 31, 2016 $ 5,743   $ 7,972