Fair Value Measurement (Fair Value Liabilities Measured Using Significant Unobservable Inputs) (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Deferred Compensation [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance-January 1, 2011	$ 0
Issuances	2,057
Interest expense included in earnings	16
Ending balance-December 31, 2011	2,073
Contingent Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance-January 1, 2011	0
Issuances	9,501
Interest expense included in earnings	70
Ending balance-December 31, 2011	$ 9,571