Restructuring Charges (Details) - Employee Separation Costs - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense	$ 1,297	$ 5,563
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	1,404
Costs incurred and charged to expense	1,297
Cash payments	(2,279)
Accrued liability ending balance	$ 422