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Derivative Financial Instruments (Details)	9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013 Foreign exchange contracts [Member] USD ($)	Sep. 30, 2013 Foreign exchange contracts [Member] GBP (£)	Sep. 30, 2013 Not Designated as Hedging Instrument [Member] Interest rate swaps [Member] Interest expense [Member] USD ($)	Sep. 30, 2012 Not Designated as Hedging Instrument [Member] Interest rate swaps [Member] Interest expense [Member] USD ($)	Sep. 30, 2013 Not Designated as Hedging Instrument [Member] Interest rate swaps [Member] Interest expense [Member] USD ($)	Sep. 30, 2012 Not Designated as Hedging Instrument [Member] Interest rate swaps [Member] Interest expense [Member] USD ($)	Sep. 30, 2013 Not Designated as Hedging Instrument [Member] Foreign exchange contracts [Member] Gain (loss) on foreign currency [Member] USD ($)	Sep. 30, 2012 Not Designated as Hedging Instrument [Member] Foreign exchange contracts [Member] Gain (loss) on foreign currency [Member] USD ($)	Sep. 30, 2013 Not Designated as Hedging Instrument [Member] Foreign exchange contracts [Member] Gain (loss) on foreign currency [Member] USD ($)	Sep. 30, 2012 Not Designated as Hedging Instrument [Member] Foreign exchange contracts [Member] Gain (loss) on foreign currency [Member] USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income on derivative				$ 12,000		$ 68,000	$ (27,000)	$ (733,000)	$ (12,000)	$ (590,000)
Notional amount	$ 11,000,000	£ 6,500,000
Maximum maturity period	1 year	1 year

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

+ Details

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X

- Definition

High end period remaining until maturity for the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Details

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