Business Segment Reporting - Financial Results (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 96,594	$ 191,324
Net income	57,401	139,998
Capital expenditures	3,617	9,247
Depreciation, depletion and amortization	3,335	1,204
Land and resource management
Segment Reporting Information [Line Items]
Revenues	56,658	160,459
Net income	39,118	123,117
Capital expenditures	88	534
Depreciation, depletion and amortization	337	177
Water services and operations
Segment Reporting Information [Line Items]
Revenues	39,936	30,865
Net income	18,283	16,881
Capital expenditures	3,529	8,713
Depreciation, depletion and amortization	$ 2,998	$ 1,027