Credit facility amount outstanding.

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Balance Type:	credit
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- Definition

Debt Additional.

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- Definition

Debt.

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- Definition

Revolving credit facility maximum interest coverage ratio as multiple.

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- Definition

Revolving credit facility maximum leverage ratio as multiple.

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Revolving credit facility minimum interest coverage ratio as multiple.

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Revolving credit facility minimum leverage ratio as multiple.

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- Definition

Interest rate stated in the contractual debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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- Definition

Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Debt (Details Textual)	9 Months Ended				9 Months Ended				9 Months Ended			9 Months Ended
Debt (Details Textual)	Sep. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)	Sep. 30, 2011 Senior Notes [Member] USD ($)	Dec. 31, 2010 Senior Notes [Member] USD ($)	Sep. 30, 2011 Letter of Credit [Member] USD ($)	Sep. 30, 2011 Letter of Credit [Member] European Bank [Member] USD ($)	Sep. 30, 2011 Letter of Credit [Member] European Bank [Member] EUR (€)	Sep. 30, 2011 New Letter of Credit [Member] USD ($)	Sep. 30, 2011 European Bank [Member] USD ($)	Sep. 30, 2011 European Bank [Member] EUR (€)	Dec. 31, 2010 European Bank [Member] USD ($)	Sep. 30, 2011 Canadian Bank [Member] USD ($)	Sep. 30, 2011 Canadian Bank [Member] CAD	Dec. 31, 2010 Canadian Bank [Member] USD ($)
Debt (Textual) [Abstract]
Outstanding Senior Notes due in 2021	$ 248,505,000	$ 248,301,000	$ 250,000,000	$ 250,000,000
Senior Notes			5.625%
Line of Credit Facility [Line Items]
Total Availability of Revolving credit facility	537,000,000				325,000,000			500,000,000	13,600,000	10,000,000		29,400,000	30,000,000
Credit facility outstanding					17,600,000	1,200,000	900,000	4,700,000	0		0	0		0
Credit facility amount outstanding								0
Annual Commitment fee (in basis points)					0.20%				0.20%	0.20%		0.125%	0.125%
Debt (Additional Textual) [Abstract]
Expiry term of revolving Credit facility	5 Year
Revolving credit facility maximum leverage ratio	3.75
Revolving credit facility minimum leverage ratio	1.00
Revolving credit facility maximum interest coverage ratio	3.00
Revolving credit facility minimum interest coverage ratio	1.00
Additional letter of credit	$ 19,000,000