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

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

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

Borrowings (Details Textuals) (USD $) In Millions	Mar. 31, 2009	Feb. 28, 2009	Jun. 30, 2011 Letter of Credit [Member]	Feb. 28, 2009 Letter of Credit [Member]
Borrowings (Additional) (Textuals)
Amount that can be borrowed under the amended agreement	$ 250.0	$ 180.0		$ 10.0
Payment made on credit facility			$ 2.0