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Shareholders' Equity Transactions Narrative (Details) (USD $)
0 Months Ended 12 Months Ended
May 21, 2013
May 16, 2013
Mar. 27, 2013
Dec. 31, 2013
votes
Dec. 31, 2012
Dec. 31, 2011
Jul. 19, 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common Stock, Par or Stated Value Per Share       $ 0.25      
Ratio of Votes Per Share of Class B Common Stock to Common Stock       10      
Class B Common Shares Dividend Rate Lower than Common Shares       10.00%      
Annual Shareholder Meeting Date   May 16, 2013          
Share-based Compensation Arrangement by Share-based Payment Award, Adoption date     Mar. 27, 2013        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date May 21, 2013            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       4,460,337      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures       756,700 761,892 608,896  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       10 years 0 months 0 days      
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited       12,925 10,631 4,900  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized       $ 11,975,000      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition       2 years 0 months 0 days      
Share based Compensation Arrangement by Share Based Payment Award Percentage of Options Vested in Year Following Issuance       25.00%      
Stock Option Related, Treasury Stock, Shares, Acquired       23,000 35,000 31,000  
Treasury Stock, Value       0 0 21,548,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value       158,000 41,000 1,429,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       14,144,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value       3,252,000      
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options       512,000 0 4,139,000  
Percentage of Class A Preferred Stock per Right       0.10%      
Right to Purchase Series A Participating Serial Preferred Purchase Price             $ 180.00
Percentage of Voting Power to be Acquired at Which Point Rights Become Exercisable       30.00%      
Percentage of the Current Market Price per Common Share to be used as Denominator of Rights used to Acquire Common Stock       50.00%      
Number of Days Following a Public Announcement of Beneficial Ownership Acquisition       10 days      
Restricted Stock [Member]
             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       114,700 118,200 101,329  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 14.49      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years 0 months 0 days      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       97,695      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value       $ 20.34      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number       264,878 260,548    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized       3,705,000 4,323,000 5,227,000  
Share-based Compensation       2,031,000 2,241,000 2,199,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value       3,778,000 4,398,000 4,362,000  
Stock Options [Member]
             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 5.33 $ 5.14 $ 8.88  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       4,460,337 [1] 1,248,033 [1] 1,914,574 [1]  
Treasury Stock, Value       $ 532,000 $ 459,000 $ 676,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term       5 years 9 months 13 days 5 years 9 months 13 days 5 years 8 months 13 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term       4 years 4 months 13 days      
[1] *Options available for grant as of December 31, 2013 reduced by net restricted stock award activity of 793,351.