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Incentive Plan (Narrative) (Details) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended
Mar. 12, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Expenses   $ 3,800,000 $ 2,800,000 $ 10,900,000 $ 9,000,000
Tax benefit   1,500,000 1,200,000 4,700,000 3,100,000
Unrecognized compensation related to non-vested share-based compensation arrangements   28,800,000   28,800,000  
Weighted-average period over which unrecognized compensation cost related to non-vested share-based compensation arrangements is expected to be recognized, in years       2 years 3 months 18 days  
Total fair value of share-based awards vested       20,500,000 11,700,000
Excess tax benefit due to carryforward loss       0  
Total intrinsic value of options exercised       2,200,000 501,000
Cash received from option exercises       4,646,000 456,000
Target number of shares to be issued 286,518        
Percentage of target number of performance-based awards will be earned       100.00%  
Minimum
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of target number of shares to be issued       0.00%  
Maximum
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of target number of shares to be issued       150.00%  
Stock Options
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Excess tax benefit if there was no net operating loss carry forwards       57,000 53,000
Options expiration period, (in years)       10 years  
Cash received from option exercises       4,300,000 302,000
Stock Options | Minimum
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting periods       3 years  
Stock Options | Maximum
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting periods       5 years  
Restricted Stock Awards
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Excess tax benefit if there was no net operating loss carry forwards       $ 4,000,000 $ 814,000
Vesting periods       3 years