Details of Selected Balance Sheet Accounts

3 Months Ended

Mar. 31, 2020

DETAILS OF SELECTED BALANCE SHEET ACCOUNTS

Additional information regarding selected balance sheet accounts at March 31, 2020 and December 31, 2019 is presented below (in thousands):



	March 31, 2020			December 31, 2019
Accounts receivable, net:
Trade	$	68,874		$	76,370
Unbilled revenue	23,164			23,041
Other	81			335
Total accounts receivable	92,119			99,746
Allowance for doubtful accounts	(245		)	(253		)
Total accounts receivable, net	$	91,874		$	99,493



	March 31, 2020		December 31, 2019
Inventories:
Finished goods and purchased products	$	4,035	$	3,982
Work in process	916		813
Raw materials	1,099		1,082
Total inventories	$	6,050	$	5,877



	Estimated Useful Life (in years)			March 31, 2020			December 31, 2019
Property, plant and equipment, net:
Land				$	39,319		$	43,147
Accommodations assets	3	—	15	1,545,034			1,696,425
Buildings and leasehold improvements	7	—	20	24,239			26,108
Machinery and equipment	4	—	15	11,274			12,060
Office furniture and equipment	3	—	7	55,136			58,005
Vehicles	3	—	5	13,987			14,604
Construction in progress				4,304			4,286
Total property, plant and equipment				1,693,293			1,854,635
Accumulated depreciation				(1,228,206		)	(1,264,326		)
Total property, plant and equipment, net				$	465,087		$	590,309



	March 31, 2020		December 31, 2019
Accrued liabilities:
Accrued compensation	$	10,475	$	17,169
Accrued taxes, other than income taxes	4,309		3,152
Other	1,379		1,434
Total accrued liabilities	$	16,163	$	21,755