Accrued Expenses and Other Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accrued Expenses and Other Current Liabilities
Property taxes	$ 7,795	$ 7,116
Other current liabilities (interest rate swap)	840	862
Accrued interest	479	500
Other accrued expenses and liabilities	1,754	1,002
Accrued expenses and other current liabilities	$ 10,868	$ 9,480