Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Statutory tax rate	33.30%	33.30%	33.30%
Non-deductible changes in fair value of contingent consideration	13.80%	(24.70%)	(16.60%)
Change in valuation allowance	(9.50%)	5.20%	(4.50%)
Income tax deferred charge	0.00%	(16.90%)	0.00%
International tax rates differential	10.90%	6.70%	6.20%
Other	(0.40%)	(2.00%)	1.10%
Effective income tax rate	48.10%	1.60%	19.50%
Income tax provision (benefit) - at Statutory tax rate	$ 26,105	$ (30,080)	$ (19,232)
Non-deductible changes in fair value of contingent consideration	10,835	22,326	9,592
Change in valuation allowance	(7,425)	(4,732)	2,616
Income tax deferred charge	0	15,273	0
International tax rates differential	8,559	(6,026)	(3,609)
Other	(339)	1,832	(611)
Income tax provision (benefit) - at Effective income tax rate	$ 37,735	$ (1,407)	$ (11,244)