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Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Summary of other comprehensive income and tax impact    
Net unrealized gain on available-for-sale securities, net of income tax expense of $26 and $92, respectively $ 41 $ 139
Net unrealized gain (loss) on interest rate swaps, net of income tax expense (benefit) of $39 and ($25), respectively 65 (43)
Foreign currency translation (14) (16)
Total other comprehensive income $ 92 $ 80