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Share-Based Compensation Arrangements (Nonvested Performance Shares) (Details) (Amended and Restated Two Thousand Three Stock Incentive Plan [Member], Performance Based Nonvested Shares [Member], USD $)
6 Months Ended
Jun. 30, 2013
Schedule of Nonvested Performance Shares Granted [Line Items]  
Equity Instruments Other than Options Minimum Shares Earned 0
Equity Instruments Other than Options Maximum Shares Earned 60,300
Grant Date Fair Value $ 26.05
Award Vesting Period 3 years
Equity Instruments Other than Options Shares Vesting Percentage 150.00%
Equity Instruments Other than Options Granted 45,225
Maximum [Member]
 
Schedule of Nonvested Performance Shares Granted [Line Items]  
Equity Instruments Other than Options Shares Earned to Target Percentage Maximum 200.00%
Minimum [Member]
 
Schedule of Nonvested Performance Shares Granted [Line Items]  
Equity Instruments Other than Options Shares Earned to Target Percentage Minimum 0.00%