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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Summary of Dilutive Effect for Awards with Exercise Price Less Than Average Stock Price
Weighted average shares were as follows (in thousands):
 
Years ended December 31,
 
2015
 
2014
 
2013
Weighted average shares outstanding, basic
40,959

 
41,396

 
41,201

Dilutive potential shares
—

 
—

 
—

Weighted average shares outstanding, diluted
40,959

 
41,396

 
41,201

Shares excluded
5,975

 
5,468

 
5,915