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Stock-Based Compensation (Details) - USD ($)
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 7,800,000   $ 6,500,000
Options, Outstanding at end of period, No intrinsic value 245,950    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options, Outstanding at beginning of period, Shares 920,505    
Options, Granted, Shares 0    
Options, Exercised, Shares (210,945)    
Options, Forfeited, Shares (1,000)    
Options, Expired, Shares (66,201)    
Options, Outstanding at end of period, Shares 642,359    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Options, Outstanding at beginning of period, Weighted-Average Exercise Price (in dollars per share) $ 20.39    
Options, Granted, Weighted-Average Exercise Price (in dollars per share) 0.00    
Options, Exercised, Weighted-Average Exercise Price (in dollars per share) 20.07    
Options, Forfeited, Weighted-Average Exercise Price (in dollars per share) 30.50    
Options, Expired, Weighted-Average Exercise Price (in dollars per share) 27.90    
Options, Outstanding at end of period, Weighted-Average Exercise Price (in dollars per share) 19.51    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Weighted-average grant date fair value of options granted $ 0.00 $ 0.00  
Total fair value of options that vested (in thousands) $ 0 $ 0  
Total intrinsic value of options exercised (in thousands) $ 1,759,000 $ 1,779,000  
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected quarterly dividends per share $ 0.200 $ 0.185  
Risk-free interest rate 0.92% 0.62%  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Restricted Stock, Outstanding at beginning of period, Shares 258,770    
Restricted Stock, Outstanding at end of period, Shares 250,695    
Restricted Stock, Granted, Shares 340,020    
Restricted Stock, Exercised, Shares (348,095)    
Restricted Stock, Forfeited, Shares 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Restricted Stock, Outstanding at beginning of period, Weighted-Average Grant Date Fair Value (in dollars per share) $ 22.31    
Restricted Stock, Granted, Weighted-Average Grant Date Fair Value (in dollars per share) 20.34 $ 21.27  
Restricted Stock, Exercised, Weighted-Average Grant Date Fair Value (in dollars per share) 18.59    
Restricted Stock, Forfeited, Weighted-Average Grant Date Fair Value (in dollars per share) 0.00    
Restricted Stock, Outstanding at end of period, Weighted-Average Grant Date Fair Value (in dollars per share) 24.82    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Weighted-average grant date fair value $ 20.34 $ 21.27  
Total fair value of restricted shares that vested (in thousands) $ 6,470,000 $ 4,854,000  
Market-Based Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate 1.00% 0.64%  
Dividend yield 2.87% 2.82%  
Expected volatility 18.73% 25.11%  
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options, Outstanding at end of period, Aggregate Intrinsic Value $ 4,700,000    
Options, Outstanding at end of period, Weighted-Average Remaining Contract Life (years) 2 years 7 months 13 days    
Executive [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Included from Shares Outstanding, Number 179,845    
Share based Compensation, weighted percentage assigned to achieving market targets 60.00%    
Share based Compensation, weighted percentage assigned to achieving performance targets 40.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year One 180,970    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year Two 165,628    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year Three 168,258    
Chairman, President, and Chief Executive Officer [Member] | Achieves a specified improvement in total shareholder return at the end of 2016 compared to 2011 and she remains an employee [Member] | Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares received if achieves specified improvement in total shareholders return 135,000    
Chairman, President, and Chief Executive Officer [Member] | Achieves a specified improvement in total shareholder return at the end of 2014 compared to 2011 and she remains an employee [Member] | Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares received if achieves specified improvement in total shareholders return 35,000    
Chairman, President, and Chief Executive Officer [Member] | Achieves a specific performance target by the end of 2019 and she remains an employee [Member] | Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares received if achieves specified improvement in total shareholders return 53,859    
Chairman, President, and Chief Executive Officer [Member] | Achieves a specific performance target by the end of 2017 and she remains an employee [Member] [Member] | Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares received if achieves specified improvement in total shareholders return 17,953    
Executive Vice President and Chief Financial Officer [Member] | Achieved performance target for 2015 and 2016 [Member] | Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, Purchase price of common stock $ 100,000    
Executive Vice President and Chief Financial Officer [Member] | Achieved performance target for 2015, 2016 and 2017 [Member] | Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, Purchase price of common stock $ 275,000    
Performance Equity Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Rate 100.00%