Fair Value Measurements (Financial Liabilities Measured At Fair Value On Recurring Basis Using Significant Unobservable Inputs) (Details) (Acquisition-related contingent consideration [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Acquisition-related contingent consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ (8,924)	$ (8,687)
Amounts (acquired) sold / (issued) settled, net	5,000	0
Transfers in and/or (out) of Level 3	0	0
Changes in fair value recorded in earnings	(40)	127
Ending Balance	$ (3,964)	$ (8,560)