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Stock-Based Compensation (Details) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Stock Options [Member]
Mar. 31, 2013
Restricted Stock [Member]
Mar. 31, 2012
Restricted Stock [Member]
Mar. 31, 2013
Market-Based Shares [Member]
Mar. 31, 2012
Market-Based Shares [Member]
Dec. 31, 2012
Executive [Member]
Performance Shares [Member]
Mar. 31, 2013
Executive [Member]
Performance Shares [Member]
Mar. 31, 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]
Mar. 31, 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]
Mar. 31, 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 (180,527)                      
Options, Exercised, Weighted-Average Exercise Price (in dollars per share) $ 12.70                      
Options, Forfeited, Shares 0                      
Options, Forfeited, Weighted-Average Exercise Price (in dollars per share) $ 0.00                      
Options, Expired, Shares (256,426)                      
Options, Expired, Weighted-Average Exercise Price (in dollars per share) $ 27.24                      
Options, Outstanding at end of period, Shares 1,555,747                      
Options, Outstanding at end of period, Weighted-Average Exercise Price (in dollars per share) $ 20.58                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                        
Options, Outstanding at end of period, Aggregate Intrinsic Value     $ 7,800,000                  
Options, Outstanding at end of period, Weighted-Average Remaining Contract Life (years)     4 years 0 months 22 days                  
Options, Exercisable at end of period, Aggregate Intrinsic Value     7,700,000                  
Options, Exercisable at end of period, Weighted-Average Remaining Contract Life (years)     4 years 0 months 18 days                  
Options, Outstanding at end of period, No intrinsic value 827,977                      
Weighted-average grant date fair value options granted (dollars per share) $ 0.00 $ 0.00                    
Total fair value of options that vested 620,000 1,058,000                    
Total intrinsic value of options exercised 1,824,000 1,722,000                    
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       226,313                
Nonvested Restricted Stock, Granted, Weighted-Average Grant-Date Fair Value (in dollars per share)       $ 19.82 $ 14.33              
Nonvested Restricted Stock, Vested, Shares       (240,158)                
Nonvested Restricted Stock, Vested, Weighted-Average Grant-Date Fair Value (in dollars per share)       $ 16.12                
Nonvested Restricted Stock, Forfeited, Shares       (866)                
Nonvested Restricted Stock, Forfeited, Weighted-Average Grant-Date Fair Value (in dollars per share)       $ 13.67                
Nonvested Restricted Stock, Nonvested at end of period, Shares       339,011                
Nonvested Restricted Stock, Nonvested at end of period, Weighted-Average Grant-Date Fair Value (in dollars per share)       $ 16.86                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]                        
Total fair value of shares that vested       $ 3,871,000 $ 3,232,000              
Expected quarterly dividends per share       $ 0.165 $ 0.145              
Risk-free interest rate       0.38% 0.69% 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%