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Business Combinations (Estimated Acquisition Earn-Out Payables) (Details) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Business Combinations [Abstract]    
Change in fair value on estimated acquisition earn-out payables$ (1,286)$ (60)$ (697)$ (1,616)
Interest expense accretion4762531,353580
Total change in estimated acquisition earn-out payables$ (810)$ 193$ 656$ (1,036)