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Supplemental Balance Sheet Information (Tables)
 3 Months Ended
Mar. 31, 2018
Balance Sheet Related Disclosures [Abstract]  
Schedule of Other Assets Components of "Other assets, net" were as follows:
 
March 31, 2018
 
December 31, 2017
Customer contracts and relationships, net
$
23,484

 
$
25,252

Other intangible assets
1,624

 
1,752

Other
4,671

 
5,797

 
$
29,779

 
$
32,801
Schedule of Other Accrued Liabilities Components of "Other accrued liabilities" were as follows:
 
March 31, 2018
 
December 31, 2017
Accrued interest
$
4,952

 
$
11,726

Asset retirement obligations
3,360

 
5,429

Property and other taxes payable
3,279

 
5,638

Accrued payroll
3,636

 
3,385

Other
7

 
162

 
$
15,234

 
$
26,340
Schedule of Asset Retirement Obligations The schedule below summarizes the changes in our asset retirement obligations:
 
March 31, 2018
 
 
 
 
Beginning asset retirement obligations
$
13,512

Revisions to existing liabilities1
4,756

Accretion expense
147

Liabilities settled
(4,360
)
Ending asset retirement obligations
14,055

Current portion of asset retirement obligations2
(3,360
)
Long-term portion of asset retirement obligations3
$
10,695


1Several factors are considered in the annual review process, including inflation rates, current estimates for removal cost, discount rates, and the estimated remaining useful life of the assets. The 2018 revisions reflect changes in removal cost estimates and the estimated remaining useful life of assets. 

2The current portion of asset retirement obligations is included in "Other current liabilities" on the Partnership's Consolidated and Condensed Balance Sheets.

3The non-current portion of asset retirement obligations is included in "Other long-term obligations" on the Partnership's Consolidated and Condensed Balance Sheets.