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Income Taxes (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Income Tax Contingency [Line Items]          
Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 13,019   $ 13,019   $ 12,028
Unrecognized tax benefits that would affect effective tax rate 11,119   11,119   10,139
Interest and penalties on unrecognized benefits 919   919   754
Effective tax rates 35.70% 35.50% 35.80% 35.20%  
Settlement and Lapse of Statute [Member]
          
Income Tax Contingency [Line Items]          
Unrecognized tax benefits within the next twelve months $ 4,218   $ 4,218