Restructuring (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring charges	$ 715	$ 4,136	$ 2,023
Components of restructuring expenses and reserve
Accrued restructuring, beginning of period	2,883	1,953
Employee severance, benefits and related costs	715	3,874
Payments	(3,524)	(2,944)
Accrued restructuring, end of period	$ 74	$ 2,883	$ 1,953