Restructuring Charges (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Restructuring Charges
Balance at the beginning of the period	$ 1,254
Balance at the end of the period	883
Restructuring Plan 2011 | Consolidation of leased facilities
Restructuring Charges
Balance at the beginning of the period	272
Utilized - cash	(260)
Balance at the end of the period	12
Restructuring Plan 2010 | Consolidation of leased facilities
Restructuring Charges
Balance at the beginning of the period	982
Utilized - cash	(111)
Balance at the end of the period	$ 871