XML 94 R71.htm IDEA: XBRL DOCUMENT v3.6.0.2
Other Intangibles (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Intangible Assets [Line Items]      
Accumulated Amortization $ (11,075) $ (10,012)  
Intangible assets, gross 25,495 25,494  
Intangible assets, net 14,420 15,482  
Rights-of-Way [Member]      
Other Intangible Assets [Line Items]      
Rights-of-way assets $ 13,268 $ 13,267  
Supply contracts [Member]      
Other Intangible Assets [Line Items]      
Estimated useful life (years) 11 years 6 months 11 years 6 months  
Intangible Assets, Gross $ 12,227 $ 12,227  
Accumulated Amortization (11,075) (10,012)  
Intangible assets, net 1,152 2,215  
Amortization expense 1,100 $ 1,100 $ 1,100
Amortization Expense, 2017 1,100    
Amortization Expense, 2018 $ 100