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Basis of Presentation and Principles of Consolidation - Comparison of Earnings Per Share Calculation Methods (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
As Reported Under the Treasury Stock Method    
Income from continuing operations used in basic per share calculation   $ 27,606outr_IncomeLossfromContinuingOperationsAttributabletoCommonShareholdersTreasuryStockMethodBasic
Income from continuing operations used in diluted per share calculation   27,606outr_IncomeLossfromContinuingOperationsAttributabletoCommonShareholdersTreasuryStockMethodDiluted
Weighted average shares used in basic per share calculation (in shares)   23,944outr_WeightedAverageNumberofSharesOutstandingTreasuryStockMethodBasic
Weighted average shares used in diluted per share calculation (in shares)   24,775outr_WeightedAverageNumberofSharesOutstandingTreasuryStockMethodDiluted
Basic earnings per common share from continuing operations (in usd per share)   $ 1.15outr_IncomeLossfromContinuingOperationsTreasuryStockMethodBasic
Diluted earnings per common share from continuing operations (in usd per share)   $ 1.11outr_IncomeLossfromContinuingOperationsTreasuryStockMethodDiluted
Amount Allocated to Participating Securities    
Income from continuing operations used in basic per share calculation (1,232)outr_UndistributedEarningsLossAllocatedtoParticipatingSecurities (746)outr_UndistributedEarningsLossAllocatedtoParticipatingSecurities
Undistributed income from continuing operations reallocated to participating shares (1,231)outr_UndistributedEarningsLossReallocatedtoParticipatingShares (727)outr_UndistributedEarningsLossReallocatedtoParticipatingShares
Weighted average shares used in basic per share calculation (in shares)   0outr_WeightedAverageNumberofSharesIssuedParticipatingSecurities
Weighted average shares used in diluted per share calculation (in shares)   (200)outr_WeightedAverageNumberDilutedSharesOutstandingParticipatingSecurities
Basic earnings per common share from continuing operations (in usd per share)   $ (0.03)outr_IncomeLossfromContinuingOperationsAllocatedtoParticipatingSecuritiesPerBasicShare
Diluted earnings per common share from continuing operations (in usd per share)   $ (0.02)outr_IncomeLossfromContinuingOperationsAllocatedtoParticipatingSecuritiesPerDilutedShare
As Revised Under the Two-Class Method    
Income from continuing operations to common shares - basic 40,775outr_IncomeLossfromContinuingOperationsAttributabletoCommonShareholdersBasic 26,860outr_IncomeLossfromContinuingOperationsAttributabletoCommonShareholdersBasic
Income from continuing operations used in diluted per share calculation $ 40,776outr_IncomeLossfromContinuingOperationsAttributabletoCommonShareholdersDiluted $ 26,879outr_IncomeLossfromContinuingOperationsAttributabletoCommonShareholdersDiluted
Weighted average shares used in basic per share calculation (in shares) 18,269us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 23,944us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average shares used in diluted per share calculation (in shares) 18,286us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 24,575us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1]
Basic earnings per common share from continuing operations (in usd per share) $ 2.23us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.12us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted earnings per common share from continuing operations (in usd per share) $ 2.23us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.09us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
[1] Participating securities were included in the calculation of diluted earnings per share using the two-class method, as this calculation was more dilutive than the calculation using the treasury stock method.