Consolidated Balance Sheets - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 359,511,000	$ 314,974,000
Accounts receivable, net	197,602,000	182,432,000
Income taxes receivable	5,578,000	5,099,000
Prepaid expenses	16,037,000	15,861,000
Inventory	59,830,000	60,603,000
Investment in equity securities	26,605,000	25,735,000
Other current assets	5,748,000	6,701,000
Assets held for sale	28,491,000	37,528,000
Total current assets	699,402,000	648,933,000
Property, plant and equipment, net	331,499,000	356,274,000
Notes receivable	61,566,000	60,588,000
Restricted cash	79,561,000	79,561,000
Other long-term assets, net	52,331,000	54,152,000
Total assets	1,224,359,000	1,199,508,000
Current liabilities:
Accounts payable	43,573,000	43,080,000
Accrued expenses	107,027,000	108,610,000
Income taxes payable	12,990,000	8,272,000
Liabilities held for sale	3,678,000	5,607,000
Total current liabilities	167,268,000	165,569,000
Decommissioning liabilities	193,041,000	190,380,000
Deferred income taxes	9,725,000	12,441,000
Other long-term liabilities	86,281,000	89,385,000
Total liabilities	456,315,000	457,775,000
Stockholders’ equity (deficit):
Accumulated deficit	(136,452,000)	(162,178,000)
Total stockholders' equity	768,044,000	741,733,000
Total liabilities and stockholders' equity	1,224,359,000	1,199,508,000
Common Class A [Member]
Stockholders’ equity (deficit):
Common Stock $0.001 par value	200,000	200,000
Additional paid in capital	902,486,000	902,486,000
Common Class B [Member]
Stockholders’ equity (deficit):
Common Stock $0.001 par value	1,000	1,000
Additional paid in capital	$ 1,809,000	$ 1,224,000