Allowance For Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2011

Allowance For Doubtful Accounts [Abstract]

Allowance for Doubtful Debts

	Year Ended December 31,
	2011		2010		2009
Bad debt provision	$	2,450,000	$	2,200,000	$	2,404,000

Impaired Notes Receivable

	Impaired Notes Receivable
Year ending December 31,	Balance Beginning of Year		Additions		Deductions		Balance End of Year		Average Outstanding Balance
2011	$	1,910,000	$	5,000	$	60,000	$	1,855,000	$	1,883,000
2010	$	2,900,000	$	676,000	$	1,666,000	$	1,910,000	$	2,405,000
2009	$	3,000,000	$	100,000	$	200,000	$	2,900,000	$	2,950,000

Reserve For Impaired Notes Receivable

	Reserve for Impaired Notes Receivable
Year ending December 31,	Balance Beginning of Year		Additions		Deductions		Balance End of Year
2011	$	930,000	$	196,000	$	60,000	$	1,066,000
2010	$	2,100,000	$	496,000	$	1,666,000	$	930,000
2009	$	1,300,000	$	900,000	$	100,000	$	2,100,000