Fair Value Measurements (Details 2) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Jun. 30, 2016	Jun. 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]		15,366
Mark to market adjustment			(3,100)
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]		8,254
Mark to market adjustment			0
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]		7,112
Mark to market adjustment			$ (3,100)

[1] Accretion expense for the three months ended June 30, 2016 was $4.0 million for the tax benefit contingency and $3.6 million for the deferred acquisition payment.