Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Components of restructuring expenses and reserve
Restructuring charges	$ 89	$ 443	$ 712	$ 1,014
Accrued restructuring, beginning of period	2,093	2,118	2,883	1,953
Employee severance, benefits and related costs	89	284	898	855
Payments	(1,075)	(1,149)	(2,674)	(1,555)
Accrued restructuring, end of period	$ 1,107	$ 1,253	$ 1,107	$ 1,253