Fair Value Measurements (Details 2) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 30, 2016	Sep. 30, 2016
Tax amortization benefit contingency
Financial instruments measured at Level 3 fair value on a recurring basis rollforward
Accretion		$ 4,000
Deferred acquisition payment
Financial instruments measured at Level 3 fair value on a recurring basis rollforward
Accretion		3,600
Contingent consideration
Financial instruments measured at Level 3 fair value on a recurring basis rollforward
Balance, beginning period			$ 172,320
Measurement period adjustment			223
Accretion	[1]		22,931
Mark to market adjustment(2)	[2]		(3,651)
Balance, ending period		191,823	191,823
Contingent consideration | Tax amortization benefit contingency
Financial instruments measured at Level 3 fair value on a recurring basis rollforward
Balance, beginning period			149,620
Measurement period adjustment			2,223
Accretion	[1]		12,206
Mark to market adjustment(2)	[2]		(551)
Balance, ending period		163,498	163,498
Contingent consideration | Deferred acquisition payment
Financial instruments measured at Level 3 fair value on a recurring basis rollforward
Balance, beginning period			22,700
Measurement period adjustment			(2,000)
Accretion	[1]		10,725
Mark to market adjustment(2)		0	(3,100)	[2]
Balance, ending period		$ 28,325	$ 28,325

[1] Accretion expense for the three months ended September 30, 2016 was $4.0 million for the tax benefit contingency and $3.6 million

[2] The mark to market adjustment for the three months ended September 30, 2016 was $0.6 million for the tax benefit contingency and $0.0 million for the deferred acquisition payment.