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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% |  |  |  |  |  |  |

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