Acquisitions, Disposition and Exit of Joint Venture (Exit of Joint Venture) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 28, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Payments for acquisitions, net of cash acquired		$ 353,654	$ 0	$ 76,801
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain		0	0	15,315
Equity Method Investment, Realized Gain (Loss) on Disposal		$ 0	$ 0	$ 12,995
Audco
Schedule of Equity Method Investments [Line Items]
Percent of business acquired	100.00%
Payments for acquisitions, net of cash acquired	$ 10,100
Ownership percentage	50.00%
Proceeds from Sale of Equity Method Investments	$ 46,200
Equity Method Investment, Summarized Financial Information, Assets	25,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	15,300
Equity Method Investment, Realized Gain (Loss) on Disposal	$ 13,000
Ownership percentage	50.00%