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Share Information (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares
Earnings per share have been calculated using the following share information:

Quarters Ended
June 30,
 
Six Months Ended 
 June 30,

2017
 
2016
 
2017
 
2016
Weighted average number of common shares used for basic EPS
33,375,989

 
34,986,905

 
33,596,435

 
35,237,742

Effect of dilutive stock options and restricted and deferred stock unit awards
683,857

 
479,860

 
685,937

 
—

Weighted average number of common shares and dilutive potential common stock used in dilutive EPS
34,059,846

 
35,466,765

 
34,282,372

 
35,237,742