Management Contracts (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Deferred tax liabilities	$ 13,900,000	$ 14,800,000
Management contracts [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Value of contracts		52,000,000
Amortization expense	1,700,000
Management contracts, net of accumulated amortization	47,900,000
Eola [Member]
Business Acquisition [Line Items]
Recorded goodwill	26,200,000	26,200,000
Liability related to contingent consideration		31,000
Deferred tax liabilities	$ 13,900,000	$ 14,800