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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Schedule of Cash Equivalents and Marketable Securities | As of December 31, 2019 and 2018, the Company had total marketable securities and cash equivalents as follows (in thousands):
| December 31, 2019 |  | December 31, 2018
Commercial paper | $ | 2,395 |  |  | $ | 8,126 |
Total cash equivalents | 2,395 |  |  | 8,126 |
U.S. Treasury securities | 12,406 |  |  | 10,133 |
Corporate notes and bonds | 26,678 |  |  | 38,036 |
Commercial paper | 3,337 |  |  | 4,687 |
Total short-term marketable securities | 42,421 |  |  | 52,856 |
Total financial assets | $ | 44,816 |  |  | $ | 60,982 |
Schedule of Asset Classification and Estimated Useful Life | The Company depreciates and amortizes the capitalized cost of these assets, using the straight-line method as follows:
Asset Classification |  | Estimated Useful Life
Buildings and building improvements |  |
Buildings |  | 20-42 years
Leasehold and building improvements |  | 2-45 years
Camp and lodging equipment |  | 8-15 years
Vehicles |  | 2-15 years
Equipment |  |
Capitalized software and computer equipment |  | 3-5 years
Containers and railcars |  | 8-16 years
All other equipment |  | 4-30 years
Furniture and fixtures |  | 5-8 years
Property, plant and equipment consisted of the following (in thousands):
| December 31, 2019 |  | December 31, 2018
Land | $ | 131,023 |  |  | $ | 123,734 |
Asset retirement costs (non-landfill) | 15,924 |  |  | 15,148 |
Landfill assets | 182,276 |  |  | 154,918 |
Buildings and improvements (1) | 499,159 |  |  | 440,188 |
Camp and lodging equipment | 158,277 |  |  | 152,998 |
Vehicles (1) | 785,056 |  |  | 721,735 |
Equipment | 1,779,366 |  |  | 1,697,490 |
Furniture and fixtures | 6,054 |  |  | 5,453 |
Construction in progress | 36,679 |  |  | 20,931 |
| 3,593,814 |  |  | 3,332,595 |
Less - accumulated depreciation and amortization | 2,005,663 |  |  | 1,770,617 |
Total property, plant and equipment, net | $ | 1,588,151 |  |  | $ | 1,561,978 |
___________________________________ (1) December 31, 2019 balances inclusive of ROU assets classified as finance leases.
Schedule of Active Landfill Sites | As of December 31, 2019, the Company had 11 active landfill sites (including the Company's two non-commercial landfills), which have estimated remaining lives (based on anticipated waste volumes and remaining highly probable airspace) as follows:
|  |  |  | Remaining Lives (Years) |  | Remaining Highly Probable Airspace (cubic yards) (in thousands)
Facility Name |  | Location |  | Permitted |  | Unpermitted |  | Total
Altair |  | Texas |  | 2 |  | 179 |  |  | — |  |  | 179 |
Buttonwillow |  | California |  | 23 |  | 5,982 |  |  | — |  |  | 5,982 |
Deer Park |  | Texas |  | 3 |  | 103 |  |  | — |  |  | 103 |
Deer Trail |  | Colorado |  | 28 |  | 1,697 |  |  | — |  |  | 1,697 |
Grassy Mountain |  | Utah |  | 43 |  | 4,909 |  |  | — |  |  | 4,909 |
Kimball |  | Nebraska |  | 7 |  | 165 |  |  | — |  |  | 165 |
Lambton |  | Ontario, Canada |  | 60 |  | 4,710 |  |  | — |  |  | 4,710 |
Lone Mountain |  | Oklahoma |  | 23 |  | 3,905 |  |  | — |  |  | 3,905 |
Ryley |  | Alberta |  | 5 |  | 653 |  |  | — |  |  | 653 |
Sawyer |  | North Dakota |  | 69 |  | 3,459 |  |  | — |  |  | 3,459 |
Westmorland |  | California |  | 64 |  | 2,732 |  |  | — |  |  | 2,732 |
|  |  |  |  |  | 28,494 |  |  | — |  |  | 28,494 |
Remaining Highly Probable Airspace | The following table presents the remaining highly probable airspace from January 1, 2017 through December 31, 2019 (in thousands of cubic yards):
| 2019 |  | 2018 |  | 2017
Remaining capacity at January 1, | 29,760 |  |  | 31,113 |  |  | 32,228 |
Changes in highly probable airspace, net | — |  |  | (223 | ) |  | — |
Consumed | (1,266 | ) |  | (1,130 | ) |  | (1,115 | )
Remaining capacity at December 31, | 28,494 |  |  | 29,760 |  |  | 31,113 |

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