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Label Element Value
Adjustments to Additional Paid in Capital, Adjustments to Performance Shares Vesting Estimates nnbr_AdjustmentstoAdditionalPaidinCapitalAdjustmentstoPerformanceSharesVestingEstimates $ 1,840,000
Stock Issued During Period, Value, New Issues us-gaap_StockIssuedDuringPeriodValueNewIssues 217,312,000
Retained Earnings [Member]  
Adjustments to Additional Paid in Capital, Adjustments to Performance Shares Vesting Estimates nnbr_AdjustmentstoAdditionalPaidinCapitalAdjustmentstoPerformanceSharesVestingEstimates (50,000)
Additional Paid-in Capital [Member]  
Adjustments to Additional Paid in Capital, Adjustments to Performance Shares Vesting Estimates nnbr_AdjustmentstoAdditionalPaidinCapitalAdjustmentstoPerformanceSharesVestingEstimates 1,890,000
Stock Issued During Period, Value, New Issues us-gaap_StockIssuedDuringPeriodValueNewIssues $ 217,168,000
Common Stock [Member]  
Stock Issued During Period, Shares, New Issues us-gaap_StockIssuedDuringPeriodSharesNewIssues 14,375,000
Stock Issued During Period, Value, New Issues us-gaap_StockIssuedDuringPeriodValueNewIssues $ 144,000