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Stockholder's Equity (Tables)
 12 Months Ended
Dec. 31, 2016
Stockholders' Equity  
Schedule of activity with respect to outstanding restricted stock units

 

 

 

 

 

 

 

 

    

 

    

Weighted-

 

 

 

 

 

Average

 

 

 

 

 

Grant-Date Fair

 

 

 

Shares

 

Value per Share

 

Nonvested at January 1,  2014

 
260,734

 

$
18

 

Granted

 
155,146

 

 
31

 

Vested

 
(157,794)

 

 
21

 

Forfeited

 
(12,334)

 

 
25

 

Nonvested at December 31, 2014

 
245,752

 

 
27

 

Granted

 
140,909

 

 
26

 

Vested

 
(110,623)

 

 
28

 

Forfeited

 
(101,520)

 

 
26

 

Nonvested at December 31, 2015

 
174,518

 

 
26

 

Granted

 
127,360

 

 
25

 

Vested

 
(62,651)

 

 
25

 

Forfeited

 
(12,537)

 

 
25

 

Nonvested at December 31, 2016

 
226,690

 

$
25