Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Restructuring and Related Activities [Abstract]
Restructuring, expected cost	$ 11,200		$ 11,200
Restructuring Reserve [Roll Forward]
Accrual, beginning balance			2,754
Restructuring costs	(29)	$ 790	137	$ 8,114	$ 11,100
Utilization			(2,656)
Accrual, ending balance	$ 235		$ 235		$ 2,754