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CLOSURE AND POST-CLOSURE LIABILITIES (Changes in Post-Closure Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Changes to post-closure liabilities |  |
Balance at the beginning of the period | $ 58,331 | $ 56,249
Liabilities assumed in acquisitions | 59 | 2,408
Measurement period adjustments from prior period acquisitions | 596 | 657
New asset retirement obligations | 1,881 | 1,983
Measurement period adjustments from prior period acquisitions | (1,170) |
Accretion | 4,748 | 5,103
Changes in estimates recorded to statement of operations | (240) | (2,619)
Changes in estimates recorded to balance sheet | (227) | (3,289)
Expenditures | (3,225) | (2,248)
Currency translation and other | 284 | 87
Balance at the end of the period | $ 61,037 | $ 58,331
Asset retirement obligations discount rate | 6.32% | 6.23%
Landfill Retirement Liability |  |
Changes to post-closure liabilities |  |
Balance at the beginning of the period | $ 30,630 | $ 32,023
Liabilities assumed in acquisitions | 0 | 0
Measurement period adjustments from prior period acquisitions | 0 | 0
New asset retirement obligations | 1,881 | 1,983
Measurement period adjustments from prior period acquisitions | 0 |
Accretion | 2,243 | 2,705
Changes in estimates recorded to statement of operations | (131) | (1,415)
Changes in estimates recorded to balance sheet | 364 | (3,289)
Expenditures | (2,777) | (1,446)
Currency translation and other | 172 | 69
Balance at the end of the period | 32,382 | 30,630
Non-Landfill Retirement Liability |  |
Changes to post-closure liabilities |  |
Balance at the beginning of the period | 27,701 | 24,226
Liabilities assumed in acquisitions | 59 | 2,408
Measurement period adjustments from prior period acquisitions | 596 | 657
Measurement period adjustments from prior period acquisitions | (1,170) |
Accretion | 2,505 | 2,398
Changes in estimates recorded to statement of operations | (109) | (1,204)
Changes in estimates recorded to balance sheet | (591) | 0
Expenditures | (448) | (802)
Currency translation and other | 112 | 18
Balance at the end of the period | $ 28,655 | $ 27,701

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- Definition The amount of change in the asset retirement obligation, during the current period, for changes in estimates recorded in the statement of income. + References No definition available. + Details
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- Definition Represents the amount of change in the asset retirement obligation, during the current period for other changes in estimates recorded in the balance sheet. + References No definition available. + Details
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- Definition The total amount of the increase or decrease in the amount of asset retirement obligations for the period that is associated with foreign currency translation (to the extent that the entity accounts for the foreign currency effects as a separate component of the change in the liability) and other asset retirement obligations. + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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