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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2017
Equity [Abstract]  
Activity Relating to Common Shares

The following table summarizes the activity relating to shares of the Company’s common stock during the six months ended June 30, 2017 (in thousands):

 

 

Issued

 

 

Treasury

 

 

Outstanding

 

 

Shares

 

 

Shares

 

 

Shares

 

Balance, as of December 31, 2016

 

45,324

 

 

 

(10,272

)

 

 

35,052

 

Shares repurchased

 

—

 

 

 

(354

)

 

 

(354

)

Vesting of performance share units

 

115

 

 

 

—

 

 

 

115

 

Stock option exercises

 

71

 

 

 

—

 

 

 

71

 

Shares acquired through cashless exercise (1)

 

—

 

 

 

(63

)

 

 

(63

)

Shares cancelled

 

(63

)

 

 

63

 

 

 

—

 

Balance, as of June 30, 2017

 

45,447

 

 

 

(10,626

)

 

 

34,821

 

 

(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.