Acquisitions - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Decrease in contingent consideration liability	$ 36,100	$ 270	$ 37,873	$ 31,331
Series of Business Acquisitions
Business Acquisition [Line Items]
Contingent consideration		(22,200)
Decrease in contingent consideration liability		300	37,900	31,300
Maximum contingent consideration		85,854
Production Graphics
Business Acquisition [Line Items]
Decrease in contingent consideration liability	5,600		7,200	$ 26,600
DB Studios
Business Acquisition [Line Items]
Contingent consideration		(3,300)
Decrease in contingent consideration liability	$ 31,000		$ 30,400
Maximum contingent consideration		$ 44,300