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Aggregate notional amount effective as of the latest balance sheet date.

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Aggregate notional amount of interest rate derivatives that will become effective after the latest balance sheet date, which relates to the currency amount specified in the interest rate derivative instruments.

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Nominal or face amount used to calculate payments on the derivative asset.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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High end of the range of variable interest rates when a range is presented for a group of interest rate derivatives.

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No definition available.

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The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The effective portion of losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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

-Publisher FASB

-Name Accounting Standards Codification

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Low end of the range of variable interest rates when a range is presented for a group of interest rate derivatives.

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No definition available.

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The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

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-Publisher FASB

-Name Accounting Standards Codification

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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Derivative Instruments and Hedging Activities (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Current notional amount at 03/31/2015	$ 125,000,000
Notional amount effective in future	75,000,000hway_NotionalAmountEffectiveInFuture		50,000,000hway_NotionalAmountEffectiveInFuture
Lower variable interest rate range (in hundredths)	0.69%
Higher variable interest rate range (in hundredths)	1.48%
Fair Values of Derivative Instruments [Abstract]
Reclassification of net losses on interest rate swap agreements from accumulated OCI to interest expense within the next 12 months	300,000
Derivatives in Cash Flow Hedging Relationships [Abstract]
Loss related to effective portion of derivatives recognized in accumulated OCI, gross of tax effect	201,000	66,000
Loss related to effective portion of derivatives reclassified from accumulated OCI to interest expense, gross of tax effect	98,000	126,000
Gains or losses on cash flow hedges recognized in our consolidated statements of comprehensive income (loss) resulting from hedge ineffectiveness	0	0
Notional amount of foreign currency exchange contracts	27,900,000us-gaap_DerivativeAssetNotionalAmount
Forward Contracts [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	376,000
Forward Contracts [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	365,000			477,000
Forward Contracts [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Other Current Assets [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	365,000			477,000
Forward Contracts [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0
Forward Contracts [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Other Noncurrent Assets [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	0			0
Forward Contracts [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0
Swap [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	524,000			395,000
Swap [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	0			0
Swap [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Other Current Assets [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	0			0
Swap [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities				0
Swap [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0			0
Swap [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Other Noncurrent Assets [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	0			0
Swap [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	212,000			0
Swap [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities				395,000
Interest Rate Swap Agreements [Member] \| Swap [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0
Interest Rate Swap Agreements [Member] \| Swap [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	312,000
Foreign Currency Exchange Contracts [Member] \| Forward Contracts [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities				111,000
Foreign Currency Exchange Contracts [Member] \| Forward Contracts [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	376,000			111,000
Foreign Currency Exchange Contracts [Member] \| Forward Contracts [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities				0
Foreign Currency Exchange Contracts [Member] \| Forward Contracts [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities				0
Foreign Currency Exchange Contracts [Member] \| Forward Contracts [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0			0
Embedded Derivative Financial Instruments [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	47,601,000			48,025,000
Embedded Derivative Financial Instruments [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0			0
Embedded Derivative Financial Instruments [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	47,601,000			48,025,000
Embedded Derivative Financial Instruments [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0			0
Embedded Derivative Financial Instruments [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0			0
Cash Convertible Notes Hedge [Member] \| Selling, General and Administrative Expenses [Member]
Derivatives in Cash Flow Hedging Relationships [Abstract]
Gains or losses on cash flow hedges recognized in our consolidated statements of comprehensive income (loss) resulting from hedge ineffectiveness	(424,000)
Cash Convertible Notes Hedge [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	47,601,000			48,025,000
Cash Convertible Notes Hedge [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Other Current Assets [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	0			0
Cash Convertible Notes Hedge [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Other Noncurrent Assets [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	47,601,000			48,025,000
Cash Conversion Derivative [Member] \| Selling, General and Administrative Expenses [Member]
Derivatives in Cash Flow Hedging Relationships [Abstract]
Gains or losses on cash flow hedges recognized in our consolidated statements of comprehensive income (loss) resulting from hedge ineffectiveness	$ 424,000