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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
Stock-Based Compensation  
Schedule of shares granted and weighted-average grant-date fair value

                                                                                                                                                                                        

 

 

June 30,

 

June 30,

 

 

 

2015

 

2014

 

 

 

Number of
Shares

 

Weighted-
Average Grant-
Date Fair Value

 

Number of
Shares

 

Weighted-
Average Grant-
Date Fair Value

 

Stock options

 
933,236 

 

$
2.06 

 
862,745 

 

$
2.65 

 

Unvested shares

 
440,516 

 

$
7.67 

 
401,754 

 

$
8.19 

 

Performance stock units

 
320,030 

 

$
6.68 

 
285,841 

 

$
7.17