Actual Cash and Non-Cash Charges of the Restructuring Plan (Details) - 2011 Restructuring - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost And Reserve [Line Items]
Total restructuring costs	$ 1,208	$ 389	$ 1,287
Cumulative Costs	5,262
Cash Charges
Restructuring Cost And Reserve [Line Items]
Total restructuring costs, reversal of incurred costs		(235)
Total restructuring costs	126		1,037
Cumulative Costs	3,174
Non-Cash Charges
Restructuring Cost And Reserve [Line Items]
Total restructuring costs	1,082	$ 624	$ 250
Cumulative Costs	$ 2,088