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Stockholders' Equity (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
September 2015 Share Repurchase Program          
Corporate Share Repurchase [Abstract]          
Share repurchase program, authorized amount $ 200,000,000 $ 200,000,000   $ 200,000,000  
Share repurchase program, period in force (maximum) 3 years        
Shares repurchased during period (shares)       6,120  
Shares repurchased during period, value   $ 500,000   $ 500,000  
August 2014 Share Repurchase Program          
Corporate Share Repurchase [Abstract]          
Shares repurchased during period (shares)     692,800   692,800
Shares repurchased during period, value     $ 38,500,000   $ 38,500,000
2002 Stock Incentive Plan | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for future option grants 800,000 800,000   800,000  
Employee Stock Purchase Plan          
Employee Stock Purchase Plan          
Shares allowed to purchase in employee stock purchase plan       1,250  
Shares issued in period       2,654 2,230
Shares available for future purchases       73,087  
Employee Stock Purchase Plan | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Net proceeds from employee stock purchase plan       $ 7,300,000 $ 4,100,000