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SIGNIFICANT ACCOUNTING POLICIES (Landfill Accounting) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) expansion landfill_site service_location cubic_yard | Dec. 31, 2016 USD ($) cubic_yard | Dec. 31, 2015 USD ($) cubic_yard
Property, Plant and Equipment [Line Items] |  |  |
Application approvals, acceptance period | 5 years |  |
Number of unpermitted expansions | expansion | 2 |  |
Number of service locations | service_location | 2 |  |
Percentage of airspace remaining | 18.40% |  |
Landfill sites | landfill_site | 11 |  |
Remaining highly probable airspace | 31,113,000 |  |
Permitted, but not highly probable airspace | 0 | 0 |
Remaining Airspace Capacity [Roll Forward] |  |  |
Remaining capacity, beginning of period (cubic yards) | 32,228,000 | 29,786,000 | 30,544,000
Addition of highly probable airspace, net (cubic yards) | 0 | 3,464,000 | 516,000
Consumed (cubic yards) | (1,115,000) | (1,022,000) | (1,274,000)
Remaining capacity, end of period (cubic yards) | 31,113,000 | 32,228,000 | 29,786,000
Landfill final closure and post-closure liabilities | $ | $ 32.4 | $ 30.6 |
Regulatory post-closure period for landfill | 30 years |  |
Asset retirement obligations, inflation rate | 1.02% | 1.02% |
Asset retirement obligations, risk free rate | 6.32% | 6.23% |
Non-landfill closure and post-closure liabilities | $ | $ 28.6 | $ 27.7 |
Minimum |  |  |
Remaining Airspace Capacity [Roll Forward] |  |  |
Non-landfill closure and post-closure liabilities, period | 10 years |  |
Maximum |  |  |
Remaining Airspace Capacity [Roll Forward] |  |  |
Non-landfill closure and post-closure liabilities, period | 30 years |  |
Landfill assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization | $ | $ 9.5 | $ 9.7 | $ 11.2
Non-commercial landfills |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Landfill sites | landfill_site | 2 |  |
Permitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 25,403,000 |  |
Unpermitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 5,710,000 |  |
Altair | Texas |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 3 years |  |
Remaining highly probable airspace | 438,000 |  |
Altair | Texas | Permitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 438,000 |  |
Altair | Texas | Unpermitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 0 |  |
Buttonwillow | California |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 20 years |  |
Remaining highly probable airspace | 6,459,000 |  |
Buttonwillow | California | Permitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 6,459,000 |  |
Buttonwillow | California | Unpermitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 0 |  |
Deer Park | Texas |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 5 years |  |
Remaining highly probable airspace | 198,000 |  |
Deer Park | Texas | Permitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 198,000 |  |
Deer Park | Texas | Unpermitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 0 |  |
Deer Trail | Colorado |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 33 years |  |
Remaining highly probable airspace | 1,812,000 |  |
Deer Trail | Colorado | Permitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 1,812,000 |  |
Deer Trail | Colorado | Unpermitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 0 |  |
Grassy Mountain | Utah |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 59 years |  |
Remaining highly probable airspace | 5,121,000 |  |
Grassy Mountain | Utah | Permitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 291,000 |  |
Grassy Mountain | Utah | Unpermitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 4,830,000 |  |
Kimball | Nebraska |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 8 years |  |
Remaining highly probable airspace | 211,000 |  |
Kimball | Nebraska | Permitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 211,000 |  |
Kimball | Nebraska | Unpermitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 0 |  |
Lambton | Ontario |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 53 years |  |
Remaining highly probable airspace | 4,882,000 |  |
Lambton | Ontario | Permitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 4,882,000 |  |
Lambton | Ontario | Unpermitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 0 |  |
Lone Mountain | Oklahoma |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 24 years |  |
Remaining highly probable airspace | 4,402,000 |  |
Lone Mountain | Oklahoma | Permitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 4,402,000 |  |
Lone Mountain | Oklahoma | Unpermitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 0 |  |
Ryley | Alberta |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 8 years |  |
Remaining highly probable airspace | 1,231,000 |  |
Ryley | Alberta | Permitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 351,000 |  |
Ryley | Alberta | Unpermitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 880,000 |  |
Sawyer | North Dakota |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 84 years |  |
Remaining highly probable airspace | 3,627,000 |  |
Sawyer | North Dakota | Permitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 3,627,000 |  |
Sawyer | North Dakota | Unpermitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 0 |  |
Westmorland | California |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 64 years |  |
Remaining highly probable airspace | 2,732,000 |  |
Westmorland | California | Permitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 2,732,000 |  |
Westmorland | California | Unpermitted |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 0 |  |

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