Maximum amount of expected deferred financing costs.

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Period Type:	instant

- Definition

Subsequent events.

+ Details

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ Details

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

- 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

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

+ Details

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- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

+ Details

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- Definition

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

+ Details

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

Subsequent Events (Details Textuals) (USD $)	6 Months Ended					6 Months Ended
Subsequent Events (Details Textuals) (USD $)	Jun. 30, 2011	Dec. 31, 2010	Aug. 01, 2011 $1.0 Billion Credit Facility [Member]	Jun. 30, 2011 $1.0 Billion Credit Facility [Member]	Dec. 31, 2010 $1.0 Billion Credit Facility [Member]	Jun. 30, 2011 $925 Million Credit Facility [Member]	Aug. 01, 2011 $925 Million Credit Facility [Member]	Aug. 01, 2011 $525 Million Revolving Credit Facility [Member]	Aug. 01, 2011 $400 Million Term Credit Facility [Member]
Subsequent Events (Textuals) [Abstract]
Credit facility			$ 1,000,000,000	$ 1,000,000,000			$ 925,000,000	$ 525,000,000	$ 400,000,000
Total credit facility, drawn at closing	1,165,346,000	1,159,215,000		700,000,000	700,000,000			200,000,000
Maturity date for new credit facility	July 25, 2012					August 1, 2015
Accrued interest on line of credit facility	LIBOR plus 2.50% or a base rate plus 0.50%					LIBOR + 2.25%
Maximum amount of expected deferred financing costs	$ 3,700,000