Compensation Plans (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) hour shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
LTIP Expense	$ 13,464,000	$ 16,119,000	$ 21,438,000
Deferred Profit Sharing
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Profit Sharing Plan Minimum Contribution, Percent	5.00%
Number of service hours required (in hours) | hour	250
Profit Sharing Plan, Contributions Vesting Immediately, Percent	40.00%
Profit Sharing Plan, Contributions Vesting Based on Years of Service, Percent	60.00%
Profit sharing expense	$ 48,000,000	47,000,000	42,000,000
2013 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
LTIP Expense	0	0	(1,124,000)
2014 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
LTIP Expense	0	(558,000)	3,227,000
2015 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
LTIP Expense	$ (168,000)	3,319,000	5,170,000
2016 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	190,000
Long-Term Incentive Compensation Plan, Maximum Value	$ 19,000,000
Long-Term Incentive Compensation Plan, Earned	17,732,700
LTIP Expense	$ 3,176,000	3,548,000	5,148,000
2017 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	202,750
Long-Term Incentive Compensation Plan, Maximum Value	$ 20,275,000
Long-Term Incentive Compensation Plan, Earned	13,509,233
LTIP Expense	$ 2,914,000	3,432,000	4,700,000
2018 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	208,750,000
Long-Term Incentive Compensation Plan, Maximum Value	$ 20,875,000
Long-Term Incentive Compensation Plan, Earned	10,007,475
LTIP Expense	$ 2,776,000	3,310,000	4,317,000
2019 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	224,250,000
Long-Term Incentive Compensation Plan, Maximum Value	$ 22,425,000
Long-Term Incentive Compensation Plan, Earned	5,497,623
LTIP Expense	$ 2,490,000	3,068,000	0
2020 grant
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	225,500,000
Long-Term Incentive Compensation Plan, Maximum Value	$ 22,550,000
Long-Term Incentive Compensation Plan, Earned	2,271,701
LTIP Expense	$ 2,276,000	$ 0	$ 0