Profit Participation Incentive Plan (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments for Capital Improvements			$ 4,397,000	$ 44,990,000
General and administrative expenses	$ 3,103,000	$ 2,919,000	5,918,000	6,118,000
Other liabilities	12,738,000		12,738,000		$ 13,614,000
Deferred Profit Sharing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in accrued liabilities	(400,000)
Payments for Capital Improvements	200,000	200,000	200,000	400,000
General and administrative expenses	200,000	$ 200,000	200,000	$ 500,000
Other liabilities	$ 2,900,000		2,900,000		$ 2,500,000
Deferred compensation arrangement with individual, distribution paid			$ 0