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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Reconciliation of Basic and Diluted Earnings Per Share Computations
The following table provides a reconciliation of basic and diluted earnings per share computations for the years ended December 31, 2015, 2014 and 2013 (in thousands, except per share amounts): 
 
Years ended December 31,
(Thousands of dollars except per share amounts)
2015
 
2014
 
2013
Earnings per common share:
 
 
 
 
 
Net income (loss) per share - basic
 
 
 
 
 
Income from continuing operations
$
137,591

 
$
222,960

 
$
154,135

Income from discontinued operations
$
38,749

 
$
20,903

 
$
80,898

Net income attributable to common stockholders
$
176,340

 
$
243,863

 
$
235,033

 
 
 
 
 
 
Weighted average common shares outstanding (in thousands)
43,434

 
46,104

 
46,743

Earnings per share:
 
 
 
 
 
Continuing operations
$
3.17

 
$
4.84

 
$
3.30

Discontinued operations
$
0.89

 
$
0.45

 
$
1.73

Total earnings per share
$
4.06

 
$
5.29

 
$
5.03

 
 
 
 
 
 
Earnings per common share - assuming dilution:
Years ended December 31,
 
2015
 
2014
 
2013
Net income (loss) per share - diluted
 
 
 
 
 
Income from continuing operations
$
137,591

 
$
222,960

 
$
154,135

Income from discontinued operations
$
38,749

 
$
20,903

 
$
80,898

Net income attributable to common stockholders
$
176,340

 
$
243,863

 
$
235,033

Weighted average common shares outstanding (in thousands)
43,434

 
46,104

 
46,743

Common equivalent shares:
 
 
 
 
 
Dilutive options
360

 
313

 
115

Weighted average common shares outstanding - assuming dilution (in thousands)
43,794

 
46,417

 
46,858

 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
Continuing operations
$
3.14

 
$
4.81

 
$
3.29

Discontinued operations
$
0.88

 
$
0.45

 
$
1.73

Earnings per share - assuming dilution
$
4.02

 
$
5.26

 
$
5.02