Company's matching contribution to the retirement plan.

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Company's contribution percentage of each eligible employees total compensation.

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Performance Based Award Percentage

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Term of stock appreciation rights.

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Weight for available cash before reserves target applied to bonus.

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Weight for safety record improvement applied to bonus.

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Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of limited partner units issued.

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Amount of payroll tax expense, compensation, postemployment and benefit-related expenses not elsewhere specified in the taxonomy (such as health plan, profit sharing, incentives, tuition reimbursement, other fringe benefits and perquisites) incurred in the period.

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-Subparagraph (SX 210.5-03.4)

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Payments of cash to employees, including wages and salaries, during the current period.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options outstanding, including both vested and non-vested options.

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Equity-Based Compensation Plans And Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 16, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 18,671,000	$ 11,019,000	$ 2,541,000
Awards outstanding	207,498,000	384,806,000
Number of common units per right	1
Number of common units issued	88,690,985	81,202,752		5,750,000
Non-cash compensation expense	12,473,000	7,197,000	(15,000)
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	37,248
Weighted average grant date fair value of phantom unit	$ 46.61
Forfeited, Number of Phantom Units	6,169
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Phantom units awarded during the period	115,716
Weighted average grant date fair value of phantom unit	$ 46.97
Forfeited, Number of Phantom Units	9,248
2010 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Phantom units awarded during the period	152,964	176,995	151,916
Weighted average grant date fair value of phantom unit	$ 46.88	$ 31.14	$ 27.82
Unrecognized compensation cost	8,800,000
Weighted average period of recognition, years	1 year
Allocated Share-based Compensation Expense	13,100,000	6,700,000
Liability for compensation awards	17,100,000	7,000,000
2007 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	5,600,000	4,300,000	600,000
Awards outstanding			0
Stock Appreciation Rights (SARs) [Member]
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	5,500,000	3,300,000	2,400,000
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	5,300,000
Bonus paid		7,900,000	6,600,000
Profit-Sharing And Retirement Savings Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee retirement plan expenses	4,300,000	3,400,000	2,600,000
Health Care Benefit Programs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Health care benefits	$ 10,400,000	$ 8,800,000	$ 8,100,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of rights (in years), Minimum	1 year	1 year	3 years 4 months 28 days
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]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of rights (in years), Minimum			0 years
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%