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Stock Incentive Plan (Schedule of Nonvested Restricted Stock Units Activity) (Details) (Restricted Stock Units (RSUs))
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock Units (RSUs)
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
RSUs granted and unvested at beginning of period: 4,701,120 4,370,975 4,945,375
Granted 108,400 2,161,220 107,500
Vested (146,250) (1,704,625) (576,050)
Cancelled (171,750) (126,450) (105,850)
RSUs granted and unvested at end of period: 4,491,520 4,701,120 4,370,975
Deferred 3,643,804