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Net Income Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Net income per common share
 
2017
 
2016
 
2015
Basic
 
 
 
 
 
     Average common shares outstanding
92,908,638

 
91,838,603

 
92,197,207

     Net income
 
 
 
 
 
Continuing operations
$
1,813,802

 
$
1,132,703

 
$
1,053,849

Discontinued operations
(41,540
)
 
—

 
—

Net income
$
1,772,262

 
$
1,132,703

 
$
1,053,849

Basic net income per common share
 
 
 
 
 
Continuing operations
$
19.52

 
$
12.33

 
$
11.43

Discontinued operations
(.44
)
 
—

 
—

Net income per common share
$
19.08

 
$
12.33

 
$
11.43

 
 
 
 
 
 
Diluted
 
 
 
 
 
Average common shares outstanding
92,908,638

 
91,838,603

 
92,197,207

Stock options and other contingently issuable shares (1)
1,931,157

 
2,089,921

 
1,826,885

Non-vested restricted stock grants
87,418

 
559,562

 
519,451

Average common shares outstanding assuming dilution
94,927,213

 
94,488,086

 
94,543,543

 
 
 
 
 
 
Net income
 
 
 
 
 
Continuing operations
$
1,813,802

 
$
1,132,703

 
$
1,053,849

Discontinued operations
(41,540
)
 
—

 
—

Net income
$
1,772,262

 
$
1,132,703

 
$
1,053,849

 
 
 
 
 
 
Diluted net income per common share
 
 
 
 
 
Continuing operations
$
19.11

 
$
11.99

 
$
11.15

Discontinued operations
(.44
)
 
—

 
—

Net income per common share
$
18.67

 
$
11.99

 
$
11.15


(1) 
Stock options and other contingently issuable shares excludes 638,795, 62,935 and 34,463 shares at December 31, 2017, 2016 and 2015, respectively, due to their anti-dilutive effect.