Derivative Instruments and Hedging Activities (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Cash Flow Hedging [Member]
Derivatives in Cash Flow Hedging Relationships [Abstract]
Loss related to effective portion of derivatives recognized in accumulated OCI, gross of tax effect	$ 2,029,000	$ 1,913,000
Loss related to effective portion of derivatives reclassified from accumulated OCI to interest expense, gross of tax effect	3,303,000	4,736,000
Gains or losses on cash flow hedges recognized in our consolidated statements of comprehensive income (loss) resulting from hedge ineffectiveness	0	0
Interest Rate Swap Agreements [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	0	0
Interest Rate Swap Agreements [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Other Current Assets [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	0	0
Interest Rate Swap Agreements [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0	0
Interest Rate Swap Agreements [Member] \| Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Current notional amount at 12/31/12	430,000,000
Notional amount effective in future	180,000,000
Description of variable rate basis	LIBOR (as defined in Note 8)
Lower variable interest rate range (in hundredths)	0.37%
Higher variable interest rate range (in hundredths)	3.385%
Fair Values of Derivative Instruments [Abstract]
Liabilities	2,963,000	4,235,000
Reclassification of net losses on interest rate swap agreements from accumulated OCI to interest expense within the next 12 months	2,000,000
Interest Rate Swap Agreements [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	1,742,000	251,000
Interest Rate Swap Agreements [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	1,221,000	3,984,000
Interest Rate Swap Agreements [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Effective in January 2013 [Member]
Derivatives, Fair Value [Line Items]
Notional amount effective in future	30,000,000
Interest Rate Swap Agreements [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Effective in November 2013 [Member]
Derivatives, Fair Value [Line Items]
Notional amount effective in future	60,000,000
Interest Rate Swap Agreements [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Effective in June 2013 [Member]
Derivatives, Fair Value [Line Items]
Notional amount effective in future	110,000,000
Interest Rate Swap Agreements [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Effective in 2015 [Member]
Derivatives, Fair Value [Line Items]
Notional amount effective in future	50,000,000
Foreign Currency Exchange Contracts [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	73,000	315,000
Foreign Currency Exchange Contracts [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Other Current Assets [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	73,000	315,000
Foreign Currency Exchange Contracts [Member] \| Derivatives Not Designated as Hedging Instruments [Member] \| Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	255,000	321,000
Foreign Currency Exchange Contracts [Member] \| Derivatives Designated as Hedging Instruments [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	255,000	321,000
Foreign Currency Exchange Contracts [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0	0
Foreign Currency Exchange Contracts [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0	0
Foreign Currency Exchange Contracts [Member] \| Forward Contracts [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Derivatives in Cash Flow Hedging Relationships [Abstract]
Notional amount of foreign currency exchange contracts	$ 15,100,000

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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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The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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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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- Definition

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

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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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Aggregate notional amount of all foreign currency derivatives not designated as hedging instruments. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

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