Fair Value Measurements (Changes in Level 3 Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
ARS [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		$ 46,283
Amount no longer subject to contingency / Settlements		(44,497)
Realized loss included in other income (expense), net		(1,786)
Contingent Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 24,814	46,022
Fair value adjustments included in other income (expense), net	(3,739)	5,592
Amount no longer subject to contingency / Settlements	$ (21,075)	(26,800)
Ending balance		$ 24,814