XML 74 R59.htm IDEA: XBRL DOCUMENT v3.3.1.900
Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Cost $ 2,093,804 $ 1,911,148
Net 1,369,318 1,248,081
Land [Member]    
Property, Plant and Equipment [Line Items]    
Cost 555,198 527,158
Net 555,198 527,158
Pipeline And Terminal Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Cost 95,244 88,447
Net 40,846 36,384
Retail Gasoline Stations [Member]    
Property, Plant and Equipment [Line Items]    
Cost 1,367,176 1,229,582
Net 746,747 662,954
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Cost 19,441 18,160
Net 8,985 8,328
Other [Member]    
Property, Plant and Equipment [Line Items]    
Cost 56,745 47,801
Net $ 17,542 $ 13,257
Minimum [Member] | Pipeline And Terminal Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (in years) 16 years  
Minimum [Member] | Retail Gasoline Stations [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (in years) 3 years  
Minimum [Member] | Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (in years) 20 years  
Minimum [Member] | Other [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (in years) 3 years  
Maximum [Member] | Pipeline And Terminal Facilities [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (in years) 25 years  
Maximum [Member] | Retail Gasoline Stations [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (in years) 50 years  
Maximum [Member] | Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (in years) 45 years  
Maximum [Member] | Other [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (in years) 20 years