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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2014
Stock-Based Compensation  
Schedule of shares granted and weighted-average grant-date fair value

 

                                                                                                                                                              

 

 

Number of
Shares

 

Weighted-
Average
Grant-Date
Fair Value

Stock options

 
862,745 

 

 $
2.65 

Unvested shares

 
401,754 

 

 $
8.19 

Performance stock units

 
285,841 

 

 $
7.17