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Stock-Based Compensation (Details) (USD $)
6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Stock Options [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2012
Restricted Stock [Member]
Jun. 30, 2013
Market-Based Shares [Member]
Jun. 30, 2012
Market-Based Shares [Member]
Dec. 31, 2012
Executive [Member]
Performance Shares [Member]
Jun. 30, 2013
Executive [Member]
Performance Shares [Member]
Jun. 30, 2013
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]
Jun. 30, 2013
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, 2013
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, Options, Outstanding [Roll Forward]                          
Options, Outstanding at beginning of period, Shares 1,992,700                        
Options, Outstanding at beginning of period, Weighted-Average Exercise Price (in dollars per share) $ 20.72                        
Options, Granted, Shares 0                        
Options, Granted, Weighted-Average Exercise Price (in dollars per share) $ 0.00                        
Options, Exercised, Shares (225,328)                        
Options, Exercised, Weighted-Average Exercise Price (in dollars per share) $ 13.09                        
Options, Forfeited, Shares 0                        
Options, Forfeited, Weighted-Average Exercise Price (in dollars per share) $ 0.00                        
Options, Expired, Shares (258,526)                        
Options, Expired, Weighted-Average Exercise Price (in dollars per share) $ 27.24                        
Options, Outstanding at end of period, Shares 1,508,846                        
Options, Outstanding at end of period, Weighted-Average Exercise Price (in dollars per share) $ 20.75                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                          
Options, Outstanding at end of period, Aggregate Intrinsic Value       $ 6,600,000                  
Options, Outstanding at end of period, Weighted-Average Remaining Contract Life (years)       3 years 9 months 14 days                  
Options, Outstanding at end of period, No intrinsic value 825,877                        
Weighted-average grant date fair value options granted (dollars per share) $ 0.00 $ 0.00                      
Total fair value of options that vested 625,000 1,058,000                      
Total intrinsic value of options exercised 2,189,000 1,917,000                      
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         353,722                
Nonvested Restricted Stock, Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value (in dollars per share)         $ 14.03                
Nonvested Restricted Stock, Granted, Shares         249,113                
Nonvested Restricted Stock, Granted, Weighted-Average Grant-Date Fair Value (in dollars per share)         $ 20.03 $ 15.63              
Nonvested Restricted Stock, Vested, Shares         (275,122)                
Nonvested Restricted Stock, Vested, Weighted-Average Grant-Date Fair Value (in dollars per share)         $ 15.93                
Nonvested Restricted Stock, Forfeited, Shares         (8,982)                
Nonvested Restricted Stock, Forfeited, Weighted-Average Grant-Date Fair Value (in dollars per share)         $ 18.05                
Nonvested Restricted Stock, Nonvested at end of period, Shares         318,731                
Nonvested Restricted Stock, Nonvested at end of period, Weighted-Average Grant-Date Fair Value (in dollars per share)         $ 17.87                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]                          
Total fair value of shares that vested         4,383,000 3,828,000              
Expected quarterly dividends per share         $ 0.165 $ 0.145              
Risk-free interest rate         0.34% 0.65% 0.36% 1.04%          
Granted and Vested in Period                 100,953        
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year One                   188,129      
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year Two                   198,369      
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year Three                   179,811      
Shares received if achieves specified improvement in total shareholders return                     135,000 35,000  
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Rate                         100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate             2.86% 3.45%          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate             25.11% 43.98%          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 6,300,000   $ 3,800,000