Debt - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2007	Jun. 30, 2013	Dec. 31, 2012
Debt Disclosure [Line Items]
Long term debt		$ 38,206,000	$ 36,062,000
Community Development District Debt
Debt Disclosure [Line Items]
Long term debt		11,665,000	9,244,000
Defeased Debt
Debt Disclosure [Line Items]
Long term debt	29,300,000	26,541,000	26,818,000
Long term debt, year of balloon payment	2015
Total Outstanding Cdd Debt
Debt Disclosure [Line Items]
Total community development district debt		$ 33,900,000	$ 34,800,000