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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 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:

 

 

Year ended December 31,

 

 

 

2018

 

 

2017

 

 

2016

 

 

 

(In thousands)

 

Common stock, beginning of period

 

 

44,251

 

 

 

45,721

 

 

 

48,297

 

Shares issued for stock options exercised

 

 

33

 

 

 

38

 

 

 

148

 

Shares of common stock issued upon lapse of RSUs

 

 

528

 

 

 

504

 

 

 

516

 

Common stock retired

 

 

(2,118

)

 

 

(2,012

)

 

 

(3,240

)

Common stock, end of period

 

 

42,694

 

 

 

44,251

 

 

 

45,721