Accounts Payable and Accrued Expenses (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Accounts payable and accrued expenses
Accounts payable	$ 6,900,000	$ 5,600,000
Accrued payroll and compensated absences	5,300,000	4,700,000
Professional fees	400,000	600,000
Accrued interest	11,800,000	14,100,000
Deferred revenue	2,300,000	2,400,000
Accrued national representation fees	1,300,000	2,000,000
Other	11,200,000	10,400,000
Accounts Payable and Accrued Expenses	$ 39,158,000	$ 39,750,000