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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Income Tax Contingency [Line Items]          
Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 14,936   $ 14,936   $ 14,018
Unrecognized tax benefits that would affect effective tax rate 12,999   12,999   12,162
Interest and penalties on unrecognized benefits $ 1,414   $ 1,414   $ 1,066
Effective tax rates 34.10% 34.70% 35.10% 35.40%  
Settlement and Lapse of Statute [Member]          
Income Tax Contingency [Line Items]          
Unrecognized tax benefits within the next twelve months $ 4,097   $ 4,097