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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities (Tables)
6 Months Ended
Jun. 30, 2019
Environmental Exit Costs by Cost
The table below reflects the amounts of accrued liabilities recorded in our consolidated balance sheets related to environmental matters that are considered to be probable and reasonably estimable. Currently, we are not able to estimate possible losses or a range of possible losses in excess of amounts accrued. Except for matters discussed above, we do not have any material environmental matters assessed as reasonably possible that would require disclosure in our consolidated financial statements.
 
June 30, 2019
 
December 31, 2018
Current
$
46

 
$
42

Non-current
278

 
295

Total environmental liabilities
$
324

 
$
337


Right Of Way [Member]  
Schedule of Rent Expense [Table Text Block]
We have certain non-cancelable rights-of-way (“ROW”) commitments, which require fixed payments and either expire upon our chosen abandonment or at various dates in the future. The table below reflects ROW expense included in operating expenses in the accompanying statements of operations:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
ROW expense
$
6

 
$
7

 
$
12

 
$
13