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Stock-Based Compensation (Details 3) (Restricted stock, USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Restricted stock
   
Number    
Unvested at the beginning of the period (in shares) 124,556 113,910
Shares awarded (in shares) 39,730,000 55,275
Restrictions lapsed and shares released to employees/directors (in shares) (44,724,000) (39,909)
Shares forfeited (in shares) (2,644) (4,720)
Unvested at the end of the period (in shares) 116,918,000 124,556
Grant date weighted-average cost    
Unvested at the beginning of the period (in dollars per share) $ 22.77 $ 22.55
Fair value of awards granted (in dollars per share) $ 29.12 $ 22.93
Restrictions lapsed and shares released to employees/directors (in dollars per share) $ 22.69 $ 22.29
Shares forfeited (in dollars per share) $ 23.03 $ 23.45
Unvested at the end of the period (in dollars per share) $ 24.95 $ 22.77