Fair Value Measurements Fair Value, Reconciliation of Level 3 - Liabilities (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		$ 129,625	$ 0	$ 130,725	$ 0
Contingent Consideration, Beginning Value		10,781	1,983
Contingent Consideration, Reclass		(285)	(331)
(Gain) loss, net from changes in fair value of contingent consideration	[1]	3,442	(279)
Contingent Consideration, Ending Value		13,938	1,373
Fair Value, Measurement with Unobservable Inputs, Unrealized Gain Loss	[2]	3,316	(279)
Convertible debt securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		$ 10,173	$ 2,757	$ 10,116	$ 2,527

[1] Changes in the fair value of contingent consideration liabilities are classified within "Acquisition-related expense (benefit), net" on the condensed consolidated statements of operations.

[2] Represents the unrealized losses or gains recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period.