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Label Element Value
Proceeds from Issuance of Common Stock us-gaap_ProceedsFromIssuanceOfCommonStock $ 287,284,000
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member]  
Defined Benefit Plan, Fair Value of Plan Assets us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 85,000
Low Volatility Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member]  
Defined Benefit Plan, Fair Value of Plan Assets us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 11,437,000
Emerging Market Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member]  
Defined Benefit Plan, Fair Value of Plan Assets us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 10,263,000
Developed Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member]  
Defined Benefit Plan, Fair Value of Plan Assets us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 19,201,000
Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member]  
Defined Benefit Plan, Fair Value of Plan Assets us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 34,800,000