Stock Based Compensation - Schedule Of Restricted Stock And RSUs (Details) (Non-Vested Restricted Stock And Restricted Stock Unit Awards(RSUs) [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Non-Vested Restricted Stock And Restricted Stock Unit Awards(RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested	$ 1,518	$ 1,096
Nonvested restricted stock and RSUs beginning balance, Shares	100,740	122,682
Nonvested restricted stock and RSUs beginning balance, Weighted Average Grant Date Fair Value	$ 24.25	$ 31.06
Granted, Shares	136,949	60,422
Weighted Average Grant Date Fair Value, Granted	$ 9.49	$ 16.08	$ 36
Vested, Shares	(71,701)	(76,883)
Weighted Average Grant Date Fair Value, Vested	$ 26.80	$ 28.75	$ 20
Forfeited, Shares	(103)	(5,481)
Weighted Average Grant Date Fair Value, Forfeited	$ 37.55	$ 23.65
Nonvested restricted stock and RSUs ending balance, Shares	165,885	100,740	122,682
Nonvested restricted stock and RSUs ending balance, Weighted Average Grant Date Fair Value	$ 10.95	$ 24.25	$ 31.06
Total restricted stock and RSU's ending balance, Shares	227,257
Total restricted stock and RSUs ending balance, Weighted Average Grant Date Fair Value	$ 17.08
Total restricted stock and RSUs at September 30, 2012, Aggregate Intrinsic Value	$ 2,079

Stock Based Compensation - Schedule Of Restricted Stock And RSUs (Details) (Non-Vested Restricted Stock And Restricted Stock Unit Awards(RSUs) [Member], USD $)
In Thousands, except Share data, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Non-Vested Restricted Stock And Restricted Stock Unit Awards(RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested

$ 1,518us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

$ 1,096us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

Nonvested restricted stock and RSUs beginning balance, Shares

100,740us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

122,682us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

Nonvested restricted stock and RSUs beginning balance, Weighted Average Grant Date Fair Value

$ 24.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

$ 31.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

Granted, Shares

136,949us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

60,422us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

Weighted Average Grant Date Fair Value, Granted

$ 9.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

$ 16.08us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

$ 36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

Vested, Shares

(71,701)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

(76,883)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

Weighted Average Grant Date Fair Value, Vested

$ 26.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

$ 28.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

$ 20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

Forfeited, Shares

(103)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

(5,481)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

Weighted Average Grant Date Fair Value, Forfeited

$ 37.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

$ 23.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

Nonvested restricted stock and RSUs ending balance, Shares

165,885us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

Nonvested restricted stock and RSUs ending balance, Weighted Average Grant Date Fair Value

$ 10.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

Total restricted stock and RSU's ending balance, Shares

227,257us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

Total restricted stock and RSUs ending balance, Weighted Average Grant Date Fair Value

$ 17.08bth_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedAndNonVestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

Total restricted stock and RSUs at September 30, 2012, Aggregate Intrinsic Value

$ 2,079bth_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedAndNonVestedRestrictedStockAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= bth_NonVestedRestrictedStockAndRestrictedStockUnitAwardsMember

- Definition

Share based compensation arrangement by share based payment award vested and non vested restricted stock aggregate intrinsic value.

+ References

No definition available.

+ Details

Name:	bth_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedAndNonVestedRestrictedStockAggregateIntrinsicValue
Namespace Prefix:	bth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Share based compensation arrangement by share based payment award vested and non vested weighted average grant date fair value.

+ References

No definition available.

+ Details

Name:	bth_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedAndNonVestedWeightedAverageGrantDateFairValue
Namespace Prefix:	bth_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

+ References

No definition available.

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant