Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring and Related Activities [Abstract]
Restructuring charges	$ 0	$ 738	$ 712	$ 1,752
Components of restructuring expenses and reserve
Accrued restructuring, beginning of period	1,107	1,253	2,883	1,953
Employee severance, benefits and related costs	0	635	898	1,490
Payments	(580)	(736)	(3,254)	(2,291)
Accrued restructuring, end of period	$ 527	$ 1,152	$ 527	$ 1,152