Derivative Investments and Hedging Activities (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Debt Instrument, Unamortized Discount	$ 33,600,000
Lower variable interest rate range (in hundredths)	0.69%
Higher variable interest rate range (in hundredths)	1.48%
Current notional amount	145,000,000
Fair Values of Derivative Instruments [Abstract]
Liabilities	27,766,000
Reclassification of net losses on interest rate swap agreements from accumulated OCI to interest expense within the next 12 months	400,000
Derivatives in Cash Flow Hedging Relationships [Abstract]
(Gain) loss related to effective portion of derivatives recognized in accumulated OCI, gross of tax effect	(332,000)	2,029,000
Loss related to effective portion of derivatives reclassified from accumulated OCI to interest expense, gross of tax effect	(1,916,000)	(3,302,000)
Selling, General and Administrative Expenses [Member]
Fair Values of Derivative Instruments [Abstract]
Derivative, Gain on Derivative	8,984,000	0
Derivative, Loss on Derivative	(8,984,000)	0
Interest Rate Swap Agreements [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Description of variable rate basis	LIBOR (as defined in Note 6)
Notional amount effective in future	95,000,000
Fair Values of Derivative Instruments [Abstract]
Liabilities	505,000	2,963,000
Interest Rate Swap Agreements [Member] | Derivatives Designated as Hedging Instruments [Member] | Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0	1,742,000
Interest Rate Swap Agreements [Member] | Derivatives Designated as Hedging Instruments [Member] | Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	505,000	1,221,000
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	0
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
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 Not Designated as Hedging Instruments [Member] | Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0	0
Interest Rate Swap Agreements [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	0	0
Foreign Currency Exchange Contracts [Member] | Derivatives Designated as Hedging Instruments [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	67,000	255,000
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] | Derivatives Not Designated as Hedging Instruments [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	178,000	73,000
Foreign Currency Exchange Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Current Assets [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	178,000	73,000
Foreign Currency Exchange Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	67,000	255,000
Foreign Currency Exchange Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0	0
Foreign Currency Exchange Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	0	0
Foreign Currency Exchange Contracts [Member] | Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	16,300,000
Cash Convertible Notes Hedges and Cash Conversion Derivative [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	27,766,000
Cash Convertible Notes Hedges and Cash Conversion Derivative [Member] | Derivatives Designated as Hedging Instruments [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	27,766,000
Cash Convertible Notes Hedges and Cash Conversion Derivative [Member] | Derivatives Designated as Hedging Instruments [Member] | Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0
Cash Convertible Notes Hedges and Cash Conversion Derivative [Member] | Derivatives Designated as Hedging Instruments [Member] | Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0
Cash Convertible Notes Hedges and Cash Conversion Derivative [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	27,766,000
Cash Convertible Notes Hedges and Cash Conversion Derivative [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Current Assets [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	0
Cash Convertible Notes Hedges and Cash Conversion Derivative [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Accrued Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	0
Cash Convertible Notes Hedges and Cash Conversion Derivative [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Long-Term Liabilities [Member]
Fair Values of Derivative Instruments [Abstract]
Liabilities	27,766,000
Cash Convertible Notes Hedges and Cash Conversion Derivative [Member] | Note Hedges and Conversions [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other Noncurrent Assets [Member]
Fair Values of Derivative Instruments [Abstract]
Assets	27,766,000
Embedded Derivative Financial Instruments [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Unamortized Discount	$ 36,750,000