Restructuring Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring, expected cost	$ 11,300
Restructuring Reserve [Roll Forward]
Accrual, beginning balance	0
Restructuring costs	11,093	$ 0	$ 0
Utilization	(8,339)
Accrual, ending balance	$ 2,754	$ 0