Profit Participation Incentive Plan (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments for Capital Improvements	$ 2,328,000	$ 29,443,000
General and administrative expenses	2,815,000	3,199,000
Other liabilities	13,825,000		$ 13,614,000
Deferred Profit Sharing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in accrued liabilities	49,000
Payments for Capital Improvements	4,000	200,000
General and administrative expenses	45,000	$ 300,000
Other liabilities	2,400,000		$ 2,500,000
Deferred Compensation Arrangement with Individual, Distribution Paid	$ 0