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Subsequent Events (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
cumbria [Abstract]        
Asset Impairment Charges $ 600,000us-gaap_AssetImpairmentCharges $ 3,475,000us-gaap_AssetImpairmentCharges $ 0us-gaap_AssetImpairmentCharges $ 834,000us-gaap_AssetImpairmentCharges
AnnualizedSavings   8,000,000bth_AnnualizedSavings    
FiveYearAnnualizedSavings   40,000,000bth_FiveYearAnnualizedSavings    
transitionCosts   6,000,000bth_TransitionCosts    
ShutDownOfFacility   2,600,000bth_ShutDownOfFacility    
Severance Costs   1,200,000us-gaap_SeveranceCosts1    
Capital Expenditures Incurred but Not yet Paid   1,000,000us-gaap_CapitalExpendituresIncurredButNotYetPaid    
Other Cost and Expense, Operating   1,200,000us-gaap_OtherCostAndExpenseOperating    
Acquisition Costs, Cumulative   5,000,000us-gaap_AcquisitionCostsCumulative    
Other Loans Payable, Long-term, Noncurrent   35,000,000us-gaap_OtherLoansPayableLongTerm    
Interest Expense, Other Long-term Debt   437,500us-gaap_InterestExpenseOtherLongTermDebt    
Equity Restrictions   2,500,000us-gaap_EquityRestrictions    
Dividend Payments Restrictions Schedule, Statutory Capital and Surplus   3,000,000us-gaap_DividendPaymentsRestrictionsScheduleStatutoryCapitalAndSurplus1    
Other Restrictions on Payment of Dividends   2.25    
Loans and Leases Receivable, Gross, Consumer, Revolving, Other   15,000,000us-gaap_LoansAndLeasesReceivableConsumerRevolvingOther    
Increase (Decrease) in Unproved Oil and Gas Property   13,000,000us-gaap_IncreaseDecreaseInUnprovedOilAndGasProperty    
Letters of Credit Outstanding, Amount   $ 1,100,000us-gaap_LettersOfCreditOutstandingAmount