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Business Segment (Summary of Information by Business Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Total Assets $ 2,083,846   $ 2,083,846   $ 1,886,241
External revenues 3,005,762 $ 3,467,986 5,496,024 $ 6,388,750  
Income (Loss) 46,310 24,820 132,184 48,337  
Net income 46,310 26,191 132,184 49,123  
Continuing Operations          
Segment Reporting Information [Line Items]          
Total Assets 2,083,846   2,083,846    
External revenues 3,005,762 3,467,986 5,496,024 6,388,750  
Income (Loss) 46,310 24,820 132,184 48,337  
Discontinued Operations          
Segment Reporting Information [Line Items]          
Total Assets 0   0    
External revenues 0 0 0 0  
Income (Loss) 0 1,371 0 786  
Operating Segments | Marketing | Continuing Operations          
Segment Reporting Information [Line Items]          
Total Assets 1,791,859   1,791,859    
External revenues 3,005,750 3,467,985 5,495,808 6,388,489  
Income (Loss) 53,442 33,468 145,867 58,223  
Corporate, Non-Segment | Continuing Operations          
Segment Reporting Information [Line Items]          
Total Assets 291,987   291,987    
External revenues 12 1 216 261  
Income (Loss) $ (7,132) $ (8,648) $ (13,683) $ (9,886)