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Quarterly Financial Data (Summary Of Quarterly Financial Data) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 847,282 us-gaap_Revenues | $ 964,114 us-gaap_Revenues | $ 1,015,049 us-gaap_Revenues | $ 1,019,719 us-gaap_Revenues | $ 961,035 us-gaap_Revenues | $ 1,090,293 us-gaap_Revenues | $ 1,068,694 us-gaap_Revenues | $ 1,014,808 us-gaap_Revenues | $ 3,846,164 us-gaap_Revenues |  | $ 4,134,830 us-gaap_Revenues |  | $ 3,367,361 us-gaap_Revenues
Operating income (loss) | 30,624 us-gaap_OperatingIncomeLoss | 35,268 us-gaap_OperatingIncomeLoss | 31,257 us-gaap_OperatingIncomeLoss | 35,402 us-gaap_OperatingIncomeLoss | 23,300 us-gaap_OperatingIncomeLoss | 24,092 us-gaap_OperatingIncomeLoss | 33,360 us-gaap_OperatingIncomeLoss | 30,005 us-gaap_OperatingIncomeLoss | 132,551 us-gaap_OperatingIncomeLoss |  | 110,757 us-gaap_OperatingIncomeLoss |  | 114,710 us-gaap_OperatingIncomeLoss
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 109,047 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 84,849 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 88,132 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income from continuing operations | 26,166 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 29,113 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 21,148 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 29,775 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 16,722 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 17,966 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 26,612 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 22,704 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 106,202 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |  | 84,004 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |  | 97,337 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income (loss) from discontinued operations |  |  |  |  | 1,164 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 508 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 290 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 143 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 2,105 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | (1,018)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income (loss) | $ 26,166 us-gaap_ProfitLoss | $ 29,113 us-gaap_ProfitLoss | $ 21,148 us-gaap_ProfitLoss | $ 29,775 us-gaap_ProfitLoss | $ 17,886 us-gaap_ProfitLoss | $ 18,474 us-gaap_ProfitLoss | $ 26,902 us-gaap_ProfitLoss | $ 22,847 us-gaap_ProfitLoss | $ 106,202 us-gaap_ProfitLoss |  | $ 86,109 us-gaap_ProfitLoss |  | $ 96,319 us-gaap_ProfitLoss
Continuing operations (in dollars per unit) | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.33 us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.24 us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.34 us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.19 us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.21 us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.32 us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.28 us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 1.18 us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax |  | $ 1.00 us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax |  | $ 1.24 us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax
Discontinued operations (in dollars per unit) |  |  |  |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic |  | $ 0.03 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic |  | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic
Net income per common unit-basic and diluted | $ 0.28 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.33 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.24 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.34 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.20 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.22 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.33 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 0.28 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 1.18 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax |  | $ 1.03 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax |  |
Cash distributions per common unit |  |  |  |  |  |  |  |  | $ 2.23000 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 2.015000 us-gaap_CommonStockDividendsPerShareCashPaid | [1] |
Per Unit Amount | $ 0.5800 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.5650 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.5500 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.5350 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.5225 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.5100 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.4975 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.4850 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.5800 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest |  | $ 0.5225 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest |  |
[1] | (1)Represents cash distributions declared and paid in the applicable period.

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