Fair Value Measurements (Level 3 Contingent Purchase Price) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Fair Value Measurement, Contingent Purchase Price [Roll Forward]
Balance at beginning of period	$ 96,957
Balance at end of period	89,673
Fair Value, Measurements, Recurring [Member]
Fair Value Measurement, Contingent Purchase Price [Roll Forward]
Balance at beginning of period	123,757
Balance at end of period	119,612
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurement, Contingent Purchase Price [Roll Forward]
Balance at beginning of period	123,757	$ 351,134
Fair value of contingent purchase price with respect to Annovation as of February 2, 2015	0	18,000
Settlements	(2,773)	(1,100)
Fair value adjustment to contingent purchase prices included in net income (loss)	(1,372)	1,518
Balance at end of period	$ 119,612	$ 369,552