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Long-Term Debt - Narrative (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
May 08, 2013
Debt Instrument [Line Items]        
Total long-term debt   $ 55,463,000us-gaap_LongTermDebt $ 56,278,000us-gaap_LongTermDebt  
Amount available under uncommitted bank facility to be used for letters of credit   2,400,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity    
Letters of credit outstanding, amount   1,100,000us-gaap_LettersOfCreditOutstandingAmount    
Redemption Premium 3,000,000us-gaap_RedemptionPremium      
Interest Costs Incurred   700,000us-gaap_InterestCostsIncurred    
Six Point Zero Percent Senior Notes Due On June Fifteen Two Thousand And Seventeen [Member]        
Debt Instrument [Line Items]        
Note issuance date   May 10, 2013    
Senior notes issued   50,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= bth_SixPointZeroPercentSeniorNotesDueOnJuneFifteenTwoThousandAndSeventeenMember		   50,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= bth_SixPointZeroPercentSeniorNotesDueOnJuneFifteenTwoThousandAndSeventeenMember
Debt Instrument, Interest Rate, Stated Percentage       6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bth_SixPointZeroPercentSeniorNotesDueOnJuneFifteenTwoThousandAndSeventeenMember
Miles Kimball [Member]        
Debt Instrument [Line Items]        
Long-term debt outstanding   $ 4,900,000us-gaap_OtherNotesPayable
/ us-gaap_ProductOrServiceAxis
= bth_MilesKimballMember		 $ 5,500,000us-gaap_OtherNotesPayable
/ us-gaap_ProductOrServiceAxis
= bth_MilesKimballMember		  
Long-term debt fixed interest rate   7.89%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_ProductOrServiceAxis
= bth_MilesKimballMember