Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			10 Months Ended	12 Months Ended
	Dec. 31, 2012 portfolio	Dec. 31, 2012 Belmont	Dec. 31, 2011 Belmont	Oct. 31, 2012 Property and rental value coverage	Dec. 31, 2012 Property and rental value coverage
Commitments and Contingencies
Employment agreements with certain executives, minimum cash-based compensation for next fiscal year	$ 4.5
Employment agreements with certain executives, grant date value of deferred compensation awards	1.0
Commitments and Contingencies.
Number of property insurance portfolios for which all-risk property and rental value coverage is maintained	2
Blanket limit per occurrence maintained under first property portfolio					775.0
Limit per occurrence maintained under second property portfolio					750.0
Limit per occurrence and in aggregate per location under liability policies				201.0
Amount of flood coverage					100.0
Loss reserves		$ 6.2	$ 6.4