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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
 Net income $ 41,043 $ 10,747
 Adjustments to reconcile net income to net cash provided by continuing operating      activities:    
 Depreciation, depletion and amortization 9,772 4,572
 Deferred income taxes 9,273 2,421
 Equity in loss of joint ventures 3,997 3,773
 Gain on remeasurement of invest in real estate partnership (51,139) 0
 Gain on sale of equipment and property (876) (9,343)
 Stock-based compensation 1,006 1,241
 Realized gain on available for sale investments 0 (297)
 Net changes in operating assets and liabilities:    
  Accounts receivable 639 (377)
  Deferred costs and other assets 151 (178)
  Accounts payable and accrued liabilities (442) 440
  Income taxes payable and receivable 2,539 (340)
  Other long-term liabilities 437 694
 Net cash provided by operating activities 16,400 13,353
Cash flows from investing activities:    
 Investments in properties (11,555) (3,200)
 Investments in joint ventures (10,031) (12,297)
 Return of capital from investments in joint ventures 20,100 1,386
 Purchases of investments available for sale 0 (24,584)
 Proceeds from sales of investments available for sale 69,865 57,240
 Cash at consolidation of real estate partnership 3,704 0
 Proceeds from the sale of assets 934 19,257
 Cash held in escrow 30 (15,073)
Net cash provided by investing activities 73,047 22,729
Cash flows from financing activities:    
 Proceeds from long-term debt 92,070 0
 Repayment of long-term debt (90,000) 0
 Debt issue costs (704) 0
 Distribution to noncontrolling interest (1,846) (713)
 Repurchase of company stock (264) (15,687)
 Exercise of employee stock options 269 0
Net cash used in financing activities (475) (16,400)
Net increase in cash and cash equivalents 88,972 19,682
Cash and cash equivalents at beginning of year 73,909 26,607
Cash and cash equivalents at end of the period $ 162,881 $ 46,289