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Restructuring Charges (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 39 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Restructuring and Related Activities [Abstract]          
Restructuring costs     $ 16,300   $ 16,300
Restructuring Reserve [Roll Forward]          
Accrual, beginning balance     562    
Restructuring costs $ 0 $ 0 419 $ 233  
Utilization     (591)    
Accrual, ending balance $ 390   $ 390