Restructuring Charges Restructuring Charges (Details) - Employee Separation Costs - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense	$ 385	$ 485
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	1,404
Costs incurred and charged to expense	385
Cash payments	(820)
Accrued liability ending balance	$ 969