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Label Element Value
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization $ 0
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization 0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 710,000
Partners' Capital Account, Sale of Units us-gaap_PartnersCapitalAccountSaleOfUnits 3,308,000
Stock Issued During Period, Value, New Issues us-gaap_StockIssuedDuringPeriodValueNewIssues 337,798,000
Stock Issued During Period, Value, New Issues us-gaap_StockIssuedDuringPeriodValueNewIssues 337,798,000
Partners' Capital Account, Distributions us-gaap_PartnersCapitalAccountDistributions 12,000
Partners' Capital Account, Distributions us-gaap_PartnersCapitalAccountDistributions 63,585,000
Partners' Capital Account, Distributions us-gaap_PartnersCapitalAccountDistributions 34,279,000
Partners' Capital Account, Treasury Units, Purchased us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases 3,308,000
Partners' Capital Account, Reallocation Between Controlling And Non-Controlling Interest step_PartnersCapitalAccountReallocationBetweenControllingAndNonControllingInterest 0
Partners' Capital Account, Reallocation Between Controlling And Non-Controlling Interest step_PartnersCapitalAccountReallocationBetweenControllingAndNonControllingInterest 0
Partners' Capital Account, Reallocation Between Controlling And Non-Controlling Interest step_PartnersCapitalAccountReallocationBetweenControllingAndNonControllingInterest 0
Adjustments To Additional Paid In Capital, Deferred Tax Effect Of Exchange step_AdjustmentsToAdditionalPaidInCapitalDeferredTaxEffectOfExchange 7,128,000
Partners' Capital Account, Contributions us-gaap_PartnersCapitalAccountContributions 27,000
Partners' Capital Account, Contributions us-gaap_PartnersCapitalAccountContributions 12,000
Adjustments To Additional Paid In Capital, Purchase Of Partnership Interests step_AdjustmentsToAdditionalPaidInCapitalPurchaseOfPartnershipInterests 127,986,000
Adjustments To Additional Paid In Capital, Purchase Of Partnership Interests step_AdjustmentsToAdditionalPaidInCapitalPurchaseOfPartnershipInterests 127,986,000
Adjustments To Additional Paid In Capital, Reallocation Of Noncontrolling Interest step_AdjustmentsToAdditionalPaidInCapitalReallocationOfNoncontrollingInterest 0
Partners' Capital Account, Unit-based Payment Arrangement, Amount us-gaap_PartnersCapitalAccountUnitBasedCompensation 725,000
Partners' Capital Account, Unit-based Payment Arrangement, Amount us-gaap_PartnersCapitalAccountUnitBasedCompensation 242,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts 9,667,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts 9,667,000
Limited Partner [Member]  
Partners' Capital Account, Sale of Units us-gaap_PartnersCapitalAccountSaleOfUnits 0
Partners' Capital Account, Distributions us-gaap_PartnersCapitalAccountDistributions 50,424,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest us-gaap_ProfitLoss 45,265,000
Partners' Capital Account, Treasury Units, Purchased us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases 0
Partners' Capital Account, Contributions us-gaap_PartnersCapitalAccountContributions 27,000
Partners' Capital Account, Unit-based Payment Arrangement, Amount us-gaap_PartnersCapitalAccountUnitBasedCompensation 723,000
Retained Earnings [Member]  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest us-gaap_ProfitLoss (790,000)
Partners' Capital [Member]  
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization (211,894,000)
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization (211,894,000)
Partners' Capital Account, Distributions us-gaap_PartnersCapitalAccountDistributions 25,235,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest us-gaap_ProfitLoss 101,718,000
Partners' Capital Account, Reallocation Between Controlling And Non-Controlling Interest step_PartnersCapitalAccountReallocationBetweenControllingAndNonControllingInterest 252,000
Partners' Capital Account, Reallocation Between Controlling And Non-Controlling Interest step_PartnersCapitalAccountReallocationBetweenControllingAndNonControllingInterest 252,000
Partners' Capital Account, Contributions us-gaap_PartnersCapitalAccountContributions 12,000
Partners' Capital Account, Unit-based Payment Arrangement, Amount us-gaap_PartnersCapitalAccountUnitBasedCompensation 240,000
Noncontrolling Interest [Member]  
Partners' Capital Account, Sale of Units us-gaap_PartnersCapitalAccountSaleOfUnits 3,308,000
Partners' Capital Account, Distributions us-gaap_PartnersCapitalAccountDistributions 13,161,000
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax 216,000
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax 350,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest us-gaap_ProfitLoss 12,428,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest us-gaap_ProfitLoss 8,335,000
Partners' Capital Account, Treasury Units, Purchased us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases 3,308,000
Partners' Capital Account, Contributions us-gaap_PartnersCapitalAccountContributions 0
Partners' Capital Account, Unit-based Payment Arrangement, Amount us-gaap_PartnersCapitalAccountUnitBasedCompensation 2,000
Partners' Capital Account, Unit-based Payment Arrangement, Amount us-gaap_PartnersCapitalAccountUnitBasedCompensation 2,000
Additional Paid-in Capital [Member]  
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization 23,432,000
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization 23,432,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 219,000
Stock Issued During Period, Value, New Issues us-gaap_StockIssuedDuringPeriodValueNewIssues 337,778,000
Stock Issued During Period, Value, New Issues us-gaap_StockIssuedDuringPeriodValueNewIssues 337,778,000
Partners' Capital Account, Reallocation Between Controlling And Non-Controlling Interest step_PartnersCapitalAccountReallocationBetweenControllingAndNonControllingInterest (103,063,000)
Adjustments To Additional Paid In Capital, Deferred Tax Effect Of Exchange step_AdjustmentsToAdditionalPaidInCapitalDeferredTaxEffectOfExchange 7,128,000
Adjustments To Additional Paid In Capital, Purchase Of Partnership Interests step_AdjustmentsToAdditionalPaidInCapitalPurchaseOfPartnershipInterests 127,979,000
Adjustments To Additional Paid In Capital, Purchase Of Partnership Interests step_AdjustmentsToAdditionalPaidInCapitalPurchaseOfPartnershipInterests 127,979,000
Adjustments To Additional Paid In Capital, Reallocation Of Noncontrolling Interest step_AdjustmentsToAdditionalPaidInCapitalReallocationOfNoncontrollingInterest (103,063,000)
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts 2,981,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts 2,981,000
AOCI Attributable to Parent [Member]  
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization (513,000)
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization (513,000)
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax 335,000
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax 207,000
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax (22,000)
Partnership Of Subsidiary [Member] | Noncontrolling Interest [Member]  
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization 188,893,000
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization 188,893,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 489,000
Partners' Capital Account, Distributions us-gaap_PartnersCapitalAccountDistributions 0
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax (50,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest us-gaap_ProfitLoss (1,604,000)
Partners' Capital Account, Reallocation Between Controlling And Non-Controlling Interest step_PartnersCapitalAccountReallocationBetweenControllingAndNonControllingInterest 103,063,000
Adjustments To Additional Paid In Capital, Reallocation Of Noncontrolling Interest step_AdjustmentsToAdditionalPaidInCapitalReallocationOfNoncontrollingInterest 103,063,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts 6,686,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts 6,686,000
Subsidiaries [Member] | Noncontrolling Interest [Member]  
APIC, Share-based Payment Arrangement, Increase for Cost Recognition us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 2,000
Partners' Capital Account, Distributions us-gaap_PartnersCapitalAccountDistributions 12,000
Partners' Capital Account, Distributions us-gaap_PartnersCapitalAccountDistributions 9,044,000
Other Comprehensive Income (Loss), Net of Tax us-gaap_OtherComprehensiveIncomeLossNetOfTax (76,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest us-gaap_ProfitLoss 710,000
Partners' Capital Account, Reallocation Between Controlling And Non-Controlling Interest step_PartnersCapitalAccountReallocationBetweenControllingAndNonControllingInterest (252,000)
Partners' Capital Account, Reallocation Between Controlling And Non-Controlling Interest step_PartnersCapitalAccountReallocationBetweenControllingAndNonControllingInterest (252,000)
Common Class B [Member] | Common Stock [Member]  
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization 73,000
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization 73,000
Adjustments To Additional Paid In Capital, Purchase Of Partnership Interests step_AdjustmentsToAdditionalPaidInCapitalPurchaseOfPartnershipInterests 7,000
Adjustments To Additional Paid In Capital, Purchase Of Partnership Interests step_AdjustmentsToAdditionalPaidInCapitalPurchaseOfPartnershipInterests 7,000
Common Class A [Member] | Common Stock [Member]  
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization 9,000
Stockholders' Equity, Effect Of Reorganization step_StockholdersEquityEffectOfReorganization 9,000
Stock Issued During Period, Value, New Issues us-gaap_StockIssuedDuringPeriodValueNewIssues 20,000
Stock Issued During Period, Value, New Issues us-gaap_StockIssuedDuringPeriodValueNewIssues $ 20,000