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Shareholders' Equity and Dividends (Tables)
 12 Months Ended
Dec. 31, 2014
Shareholders' Equity and Dividends [Abstract]  
Schedule of Quarterly Dividends Declared and Paid
The following table summarizes regular quarterly cash dividends declared and paid in 2014, 2013, and 2012 (in thousands of dollars, except per share amounts):
    
Year
 
Dividends Per Common Share
 
Total Dividends
2014
 
$
0.40

 
$
27,636

2013
 
$
0.20

 
$
13,754

2012
 
$
0.52

 
$
35,223