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Stockholder's Equity (Tables)
 12 Months Ended
Dec. 31, 2017
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,  2015

 

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

 

Granted

 

164,190

 

 

24

 

Vested

 

(78,623)

 

 

25

 

Forfeited

 

(1,167)

 

 

21

 

Nonvested at December 31, 2017

 

311,090

 

$

25