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Stock-Based Compensation (Details) (USD $)
6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Stock Options [Member]
Jun. 30, 2014
Restricted Stock [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2014
Market-Based Shares [Member]
Jun. 30, 2013
Market-Based Shares [Member]
Feb. 28, 2014
Executive [Member]
Performance Shares [Member]
Jun. 30, 2014
Executive [Member]
Performance Shares [Member]
Mar. 31, 2012
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]
Chairman, President, and Chief Executive Officer [Member]
Mar. 31, 2012
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]
Chairman, President, and Chief Executive Officer [Member]
Jun. 30, 2014
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%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 7,700,000   $ 4,600,000                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]                          
Options, Outstanding at beginning of period, Shares 1,343,666                        
Options, Outstanding at beginning of period, Weighted-Average Exercise Price (in dollars per share) $ 20.63                        
Options, Granted, Shares 0                        
Options, Granted, Weighted-Average Exercise Price (in dollars per share) $ 0.00                        
Options, Exercised, Shares (236,260)                        
Options, Exercised, Weighted-Average Exercise Price (in dollars per share) $ 18.90                        
Options, Forfeited, Shares (17,151)                        
Options, Forfeited, Weighted-Average Exercise Price (in dollars per share) $ 26.43                        
Options, Expired, Shares (22,784)                        
Options, Expired, Weighted-Average Exercise Price (in dollars per share) $ 25.91                        
Options, Outstanding at end of period, Shares 1,067,471                        
Options, Outstanding at end of period, Weighted-Average Exercise Price (in dollars per share) $ 20.80                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                          
Nonvested Restricted Stock, Nonvested at beginning of period, Shares         315,305                
Nonvested Restricted Stock, Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value (in dollars per share)         $ 17.87                
Nonvested Restricted Stock, Granted, Shares         242,164                
Nonvested Restricted Stock, Granted, Weighted-Average Grant-Date Fair Value (in dollars per share)         $ 21.27 $ 20.03              
Nonvested Restricted Stock, Vested, Shares         (292,052)                
Nonvested Restricted Stock, Vested, Weighted-Average Grant-Date Fair Value (in dollars per share)         $ 16.64                
Nonvested Restricted Stock, Forfeited, Shares         0                
Nonvested Restricted Stock, Forfeited, Weighted-Average Grant-Date Fair Value (in dollars per share)         $ 0.00                
Nonvested Restricted Stock, Nonvested at end of period, Shares         265,417                
Nonvested Restricted Stock, Nonvested at end of period, Weighted-Average Grant-Date Fair Value (in dollars per share)         $ 22.31                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                          
Options, Outstanding at end of period, Aggregate Intrinsic Value       9,400,000                  
Options, Outstanding at end of period, Weighted-Average Remaining Contract Life (years)       3 years 2 months 13 days                  
Options, Outstanding at end of period, No intrinsic value 297,350                        
Weighted-average grant date fair value options granted (dollars per share) $ 0.00 $ 0.00                      
Total fair value of options that vested 0 625,000                      
Total intrinsic value of options exercised 1,779,000 2,189,000                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]                          
Total fair value of shares that vested         $ 4,854,000 $ 4,383,000              
Expected quarterly dividends per share         $ 0.185 $ 0.165              
Risk-free interest rate         0.62% 0.34% 0.64% 0.36%          
Granted and Vested in Period                 112,864        
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                   198,369      
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year Two                   179,811      
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year Three                   175,735      
Shares received if achieves specified improvement in total shareholders return                     135,000 35,000  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate             2.82% 2.86%          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate             25.11% 25.11%