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Income Taxes (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Income Tax Contingency [Line Items]      
Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 12,683   $ 12,028
Unrecognized tax benefits that would affect effective tax rate 10,789   10,139
Interest and penalties on unrecognized benefits 825   754
Effective tax rates 35.90% 34.90%  
Settlement and Lapse of Statute [Member]
      
Income Tax Contingency [Line Items]      
Unrecognized tax benefits within the next twelve months $ 4,196