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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2018
Stockholders Equity Note [Abstract]  
Reconciliation of Number of Shares of Common Stock

A reconciliation of the number of shares of our common stock follows:

 

 

Six months ended June 30,

 

 

 

2018

 

 

2017

 

 

 

(In thousands)

 

Common stock, beginning of period

 

 

44,251

 

 

 

45,721

 

Shares issued for stock options exercised

 

 

-

 

 

 

38

 

Shares of common stock issued upon lapse of restricted stock units ("RSUs")

 

 

329

 

 

 

341

 

Common stock retired

 

 

(1,412

)

 

 

(1,065

)

Common stock, end of period

 

 

43,168

 

 

 

45,035