OTHER BALANCE SHEET INFORMATION - Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Other non-current liabilities:
Asset retirement obligations	$ 8,915	$ 9,035
Environmental liabilities	2,226	3,446
Accrued sales, use and other taxes	16,820	16,735
Deferred tax liabilities	0	35
Other	0	528
Total	$ 27,961	$ 29,779

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent.

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