Debt (Details) (USD $) In Thousands, unless otherwise specified		3 Months Ended		6 Months Ended
	Dec. 31, 2011	Jun. 30, 2012 Discontinued operations [Member]	Jun. 30, 2011 Discontinued operations [Member]	Jun. 30, 2012 Discontinued operations [Member]	Jun. 30, 2011 Discontinued operations [Member]	Jun. 30, 2012 Liabilities held for sale [Member]
Summary of Credit Facilities and Related Information
Letters of credit outstanding	$ 4,785					$ 4,388
Borrowings						40,000
Interest rate on revolver borrowings						3.99075%
Interest expense (including commitment and letter of credit fees)		386	325	708	646
Amortization of issuance costs		$ 182	$ 181	$ 363	$ 362