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Share-Based Compensation Plans (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Dec. 31, 2012
Restricted Stock Granted in Period     474,050 1,015,273
Stock Options, Exercises in Period     0 0
Stock Options, Issued in Period     0 0
Non-management Director Stock Award, Granted and Vested in period 5,100 4,500    
Class B Common Stock Bonus [Member]
       
Restricted Stock Granted in Period     474,050 480,773
Restricted stock requisite service period     3 years  
Class B Common Stock Key Employees [Member]
       
Restricted stock requisite service period       10 years