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Quarterly Financial Data (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Summary of Condensed Quarterly Results of Operations

The condensed quarterly results of operations for the years ended December 31, 2015 and 2014 (in thousands of dollars, except per share data) were as follows:

 

     Quarter Ended  
     March 31,      June 30,      September 30,      December 31,  
     2015      2015      2015      2015  
     (Thousands of dollars, except per share data)  

Operating revenues

   $ 204,197       $ 198,547       $ 214,733       $ 186,751   

Gain (loss) on disposition of assets, net

     7         66         165         (577

Earnings (loss) before income taxes

     16,984         11,044         14,290         938   

Net earnings

     10,363         6,454         7,669         2,438   

Net earnings per share

           

Basic

     0.67         0.41         0.49         0.16   

Diluted

     0.66         0.41         0.49         0.16   

 

     Quarter Ended  
     March 31,      June 30,      September 30,      December 31,  
     2014      2014      2014      2014  
     (Thousands of dollars, except per share data)  

Operating revenues, net

   $ 197,071       $ 212,145       $ 216,294       $ 210,760   

Gain (loss) on disposition of assets, net

     (1,073      (242      (56      523   

Earnings (loss) before income taxes

     (8,513      21,700         28,277         11,651   

Net earnings (loss)

     (5,321      13,368         17,249         7,392   

Net earnings (loss) per share

           

Basic

     (0.34      0.86         1.11         0.48   

Diluted

     (0.34      0.85         1.10         0.47