Schedule of Cash Equivalents and Marketable Securities |
As of December 31, 2020 and 2019, the Company had total marketable securities and cash equivalents as follows (in thousands): | | | | | | | | | | | | | December 31, 2020 | | December 31, 2019 | Commercial paper | $ | — | | | $ | 2,395 | | Total cash equivalents | — | | | 2,395 | | U.S. Treasury securities | 28,901 | | | 12,406 | | Corporate notes and bonds | 22,956 | | | 26,678 | | Commercial paper | — | | | 3,337 | | | | | | Total marketable securities | 51,857 | | | 42,421 | | Total | $ | 51,857 | | | $ | 44,816 | |
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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, 2020 | | December 31, 2019 | Land | $ | 139,776 | | | $ | 131,023 | | Asset retirement costs (non-landfill) | 16,407 | | | 15,924 | | Landfill assets | 191,687 | | | 182,276 | | Buildings and improvements (1) | 509,804 | | | 499,159 | | Camp equipment | 159,021 | | | 158,277 | | Vehicles (2) | 844,026 | | | 785,056 | | Equipment (3) | 1,807,235 | | | 1,779,366 | | Furniture and fixtures | 7,082 | | | 6,054 | | Construction in progress | 24,378 | | | 36,679 | | | 3,699,416 | | | 3,593,814 | | Less - accumulated depreciation and amortization | 2,174,118 | | | 2,005,663 | | Total property, plant and equipment, net | $ | 1,525,298 | | | $ | 1,588,151 | |
___________________________________ (1) Balances inclusive of gross ROU assets classified as finance leases of $8.9 million and $31.0 million, respectively. (2) Balances inclusive of gross ROU assets classified as finance leases of $47.2 million and $2.4 million, respectively. (3) December 31, 2020 balance inclusive of gross ROU assets classified as finance leases of $9.3 million.
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Schedule of Active Landfill Sites |
As of December 31, 2020, the Company had 9 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: | | | | | | | | | | | | | | | | | | | | | Facility Name | | Location | | Remaining Lives (Years) | | Permitted Remaining Highly Probable Airspace (cubic yards) (in thousands) | Buttonwillow | | California | | 22 | | 5,739 | | Deer Park | | Texas | | 2 | | 67 | | Deer Trail | | Colorado | | 27 | | 1,629 | | Grassy Mountain | | Utah | | 41 | | 4,710 | | Kimball | | Nebraska | | 6 | | 144 | | Lambton | | Ontario, Canada | | 51 | | 4,633 | | Lone Mountain | | Oklahoma | | 32 | | 3,803 | | Ryley | | Alberta, Canada | | 5 | | 575 | | Sawyer | | North Dakota | | 68 | | 3,416 | | | | | | | | 24,716 | |
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Schedule of Remaining Highly Probable Airspace |
The following table presents the remaining highly probable airspace from January 1, 2018 through December 31, 2020 (in thousands of cubic yards): | | | | | | | | | | | | | | | | | | | 2020 | | 2019 | | 2018 | Remaining capacity, beginning of year | 28,494 | | | 29,760 | | | 31,113 | | Changes in highly probable airspace, net | (2,962) | | | — | | | (223) | | Consumed | (816) | | | (1,266) | | | (1,130) | | Remaining capacity, end of year | 24,716 | | | 28,494 | | | 29,760 | |
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