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.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Notes Payable (Details Textuals) (USD $)	9 Months Ended
Notes Payable (Details Textuals) (USD $)	Sep. 30, 2011 rate countries years	Sep. 30, 2011 New Revolving Loan Facility [Member]	Mar. 08, 2011 New Revolving Loan Facility [Member] rate	Dec. 19, 2011 Old Revolving Loan Facility [Member]
Notes Payable [Line Items]
Borrowing capacity under Revolving Loan Facility			$ 600,000,000	$ 575,000,000
Borrowing rate under Revolving Loan Facility			137.5
Leverage ratio on restrictive financial covenants	35.00%
Contracutal interest rate on borrowing under the Facility	1.63%
Commitment fees for Revolving Loan Facility	0.20%
Remaining borrowing capacity under Revolving Loan Facility as reduced by outstanding letters of credit		$ 392,200,000