Details of Selected Balance Sheet Accounts (Tables)

3 Months Ended

Mar. 31, 2020

Balance Sheet Related Disclosures [Abstract]

Schedule of Accounts Receivable

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

Schedule of Inventories

	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

Property, Plant and Equipment

	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

Schedule of Accrued Liabilities

	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