Summary of Significant Accounting Policies - Reconciliation of Restructuring Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Reserve [Roll Forward]
Charged to restructuring costs				$ 753	$ 1,274	$ 840
On-Going Benefit Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period				47	762
Charged to restructuring costs				0	17
Payments				(47)	(732)
Balance at end of period	$ 47			0	47	762
Exit Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period				46	868
Charged to restructuring costs				0	88
Payments				(46)	(655)
Balance at end of period	46			0	46	868
Cost Optimization Project
Restructuring Reserve [Roll Forward]
Charged to restructuring costs	100	$ 200	$ 1,000
Cost Optimization Project | On-Going Benefit Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period				44	0
Charged to restructuring costs				563	633
Payments				(282)	(589)
Balance at end of period	44			325	44	0
Cost Optimization Project | Exit Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period				338	0
Charged to restructuring costs				190	641
Payments				(255)	(303)
Balance at end of period	$ 338			$ 273	$ 338	$ 0