Compensation Plans (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
LTIP Expense	$ 20,413,000	$ 20,873,000	$ 23,011,000
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%
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	$ 39,000,000	42,000,000	38,000,000
2011 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	197,500
Long-Term Incentive Compensation Plan, Maximum Value	$ 49,375,000
Long-Term Incentive Compensation Plan, Earned	31,852,800
LTIP Expense	$ (82,000)	7,397,000	9,855,000
2013 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	209,750
Long-Term Incentive Compensation Plan, Maximum Value	$ 20,975,000
Long-Term Incentive Compensation Plan, Earned	9,883,420
LTIP Expense	$ 8,918,000	7,336,000	9,493,000
Long-term Incentive Compensation Plan, 2014 [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	211,250
Long-Term Incentive Compensation Plan, Maximum Value	$ 21,125,000
Long-Term Incentive Compensation Plan, Earned	7,239,538
LTIP Expense	$ 3,503,000	2,935,000	3,663,000
Long-term Incentive Compensation Plan, 2015 [Member] [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Long-Term Incentive Compensation Plan, Number of Units Oustanding | shares	230,500,000
Long-Term Incentive Compensation Plan, Maximum Value	$ 23,050,000
Long-Term Incentive Compensation Plan, Earned	4,001,480
LTIP Expense	$ 4,072,000	$ 3,205,000	$ 0