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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Stock-Based Compensation  
Summary of the Company's restricted stock activity

 

 

 

Shares

 

Weighted Average
Grant-Date Fair Value

 

Aggregate
Intrinsic Value

 

December 31, 2012

 

979,022

 

$

15.28

 

 

 

Granted

 

448,026

 

31.41

 

 

 

Vested

 

(244,059

)

15.74

 

 

 

Forfeited

 

(14,789

)

23.29

 

 

 

December 31, 2013

 

1,168,200

 

$

23.75

 

$

55.1