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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Activity Relating to Common Shares

The following table summarizes the activity relating to shares of the Company’s common stock during the three months ended March 31, 2018 (in thousands):

 

 

Issued

 

 

Treasury

 

 

Outstanding

 

 

Shares

 

 

Shares

 

 

Shares

 

Balance, as of December 31, 2017

 

45,778

 

 

 

(11,043

)

 

 

34,735

 

Shares repurchased

 

—

 

 

 

(93

)

 

 

(93

)

Vesting of performance share units

 

127

 

 

 

—

 

 

 

127

 

Stock option exercises

 

804

 

 

 

—

 

 

 

804

 

Restricted stock grants

 

50

 

 

 

—

 

 

 

50

 

Shares acquired through cashless exercise (1)

 

—

 

 

 

(611

)

 

 

(611

)

Shares cancelled

 

(611

)

 

 

611

 

 

 

—

 

Balance, as of March 31, 2018

 

46,148

 

 

 

(11,136

)

 

 

35,012

 

 

(1)

All shares acquired represent shares tendered to cover the strike price for options and tax withholdings on the intrinsic value of options exercised or performance share units vested. These shares have been cancelled by the Company.