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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Schedule of Cash Equivalents and Marketable Securities | As of December 31, 2018 and 2017 the Company has recorded total marketable securities and cash equivalents of $61.0 million and $40.2 million, respectively, as shown below (in thousands). (2) SIGNIFICANT ACCOUNTING POLICIES (Continued)
| December 31, 2018 |  | December 31, 2017
Commercial paper | $ | 8,126 |  |  | $ | 2,048 |
Total cash equivalents | 8,126 |  |  | 2,048 |
U.S. Treasury securities | 10,133 |  |  | 3,855 |
Corporate notes and bonds | 38,036 |  |  | 32,729 |
Commercial paper | 4,687 |  |  | 1,595 |
Total short-term marketable securities | 52,856 |  |  | 38,179 |
Total financial assets | $ | 60,982 |  |  | $ | 40,227 |
Schedule of Asset Classification and Estimated Useful Life | The Company depreciates and amortizes the 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, 2018 |  | December 31, 2017
Land | $ | 123,734 |  |  | $ | 121,658 |
Asset retirement costs (non-landfill) | 15,148 |  |  | 14,593 |
Landfill assets | 154,918 |  |  | 144,539 |
Buildings and improvements | 440,188 |  |  | 414,384 |
Camp and lodging equipment | 152,998 |  |  | 170,012 |
Vehicles | 721,735 |  |  | 617,959 |
Equipment | 1,697,490 |  |  | 1,644,102 |
Furniture and fixtures | 5,453 |  |  | 5,708 |
Construction in progress | 20,931 |  |  | 57,618 |
| 3,332,595 |  |  | 3,190,573 |
Less - accumulated depreciation and amortization | 1,770,617 |  |  | 1,603,208 |
Total property, plant and equipment, net | $ | 1,561,978 |  |  | $ | 1,587,365 |
Schedule of Active Landfill Sites | As of December 31, 2018, 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 |  | 3 |  | 311 |  |  | — |  |  | 311 |
Buttonwillow |  | California |  | 21 |  | 6,234 |  |  | — |  |  | 6,234 |
Deer Park |  | Texas |  | 4 |  | 141 |  |  | — |  |  | 141 |
Deer Trail |  | Colorado |  | 28 |  | 1,755 |  |  | — |  |  | 1,755 |
Grassy Mountain |  | Utah |  | 51 |  | 194 |  |  | 4,830 |  |  | 5,024 |
Kimball |  | Nebraska |  | 9 |  | 190 |  |  | — |  |  | 190 |
Lambton |  | Ontario |  | 64 |  | 4,821 |  |  | — |  |  | 4,821 |
Lone Mountain |  | Oklahoma |  | 18 |  | 4,124 |  |  | — |  |  | 4,124 |
Ryley |  | Alberta |  | 7 |  | 906 |  |  | — |  |  | 906 |
Sawyer |  | North Dakota |  | 87 |  | 3,522 |  |  | — |  |  | 3,522 |
Westmorland |  | California |  | 64 |  | 2,732 |  |  | — |  |  | 2,732 |
|  |  |  |  |  | 24,930 |  |  | 4,830 |  |  | 29,760 |
Remaining Highly Probable Airspace | The following table presents the remaining highly probable airspace from January 1, 2016 through December 31, 2018 (in thousands of cubic yards):
| 2018 |  | 2017 |  | 2016
Remaining capacity at January 1, | 31,113 |  |  | 32,228 |  |  | 29,786 |
Changes in highly probable airspace, net | (223 | ) |  | — |  |  | 3,464 |
Consumed | (1,130 | ) |  | (1,115 | ) |  | (1,022 | )
Remaining capacity at December 31, | 29,760 |  |  | 31,113 |  |  | 32,228 |

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