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Weighted Average Shares (Tables)
12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Calculation of Weighted Average Shares
Weighted-average shares were calculated as follows (in thousands):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Basic weighted-average common shares outstanding
86,296

 
86,858

 
86,946

Effect of dilutive stock options
1,695

 
2,213

 
1,955

Diluted weighted-average common and common-equivalent shares outstanding
87,991

 
89,071

 
88,901