Subsequent Event (Details) (USD $) In Thousands, unless otherwise specified	Apr. 07, 2010	Jul. 02, 2009	Mar. 31, 2012 Refinancing of Debt [Member]	Jun. 09, 2010 Majority-Owned Subsidiary, Unconsolidated [Member]	Mar. 31, 2012 Majority-Owned Subsidiary, Unconsolidated [Member] Refinancing of Debt [Member]
Subsequent Event [Line Items]
Line of credit facility, reduction in maximum borrowing capacity			$ 40,000		$ 500,000
Line of credit facility, maximum borrowing capacity	$ 290,000	$ 270,000	$ 250,000	$ 25,000	$ 675,000

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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