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Equity-Based Compensation Plans And Employee Benefit Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 22, 2015	Apr. 10, 2015	Sep. 26, 2014	Sep. 16, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 6,922	$ 6,821	$ 18,671
Number of common units per right	1
Common units, issued	109,979,218	95,029,218			10,350,000	4,600,000	4,600,000	5,750,000
Non-cash compensation expense	$ 5,014	$ 4,494	$ 12,473
Employer contribution percentage to retirement plan	6.00%
Employer profit-sharing contribution percentage	3.00%
Service-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Phantom units awarded during the period	58,192
Weighted average grant date fair value of phantom unit	$ 44.40
Forfeited, Number of Phantom Units	2,856
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Phantom units awarded during the period	154,633
Weighted average grant date fair value of phantom unit	$ 45.15
Forfeited, Number of Phantom Units	4,201
2010 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Phantom units awarded during the period	212,825	125,988	152,964
Weighted average grant date fair value of phantom unit	$ 44.95	$ 54.14	$ 46.88
Unrecognized compensation cost	$ 5,500
Weighted average period of recognition, years	1 year
Allocated Share-based Compensation Expense	$ 7,700	$ 8,800
Liability for compensation awards	12,300	15,400
2007 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ (800)	(2,000)	$ 5,600
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of recognition, years	1 year
Term of awards, years	10 years
Total intrinsic value of rights exercised	$ 800	1,400	5,500
Bonus Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted percentage of target level of available cash before reserves	90.00%
Weighted percentage of achievement level of available cash before reserves	10.00%
Accrued bonus	$ 5,000
Bonus paid		7,800	5,300
Profit-Sharing And Retirement Savings Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee retirement plan expenses	8,200	6,300	4,300
Health Care Benefit Programs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Health care benefits	$ 15,200	$ 13,500	$ 10,400
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of rights (in years), Minimum		1 year	1 year	1 year
Maximum [Member] \| 2010 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Based Award Percentage	150.00%
Minimum [Member] \| 2010 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Based Award Percentage	50.00%