FINANCING RECEIVABLES (Details) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2011 D segment	Sep. 30, 2010	Dec. 31, 2010
FINANCING RECEIVABLES
Total financed receivables	$ 22,800,000		$ 21,200,000
Number of days to elapse for financing receivables to be charged-off (in days)	180
Charge-offs as a percentage of average financing receivables (as a percent)	2.40%	3.20%	4.00%
Number of days past due to record write-offs (in days)	180
Allowance for doubtful accounts related to financing receivables
Balance, beginning of period	2,700,000	2,600,000	2,600,000
Additions to allowance	738,000	753,000	995,000
Deductions, net of recoveries	(538,000)	(703,000)	(895,000)
Balance, end of period	2,900,000	2,650,000	2,700,000
Past due financing receivables
30-59 days past due	553,000		833,000
60-89 days past due	150,000		382,000
90 days or more past due	292,000		370,000
Total	$ 995,000		$ 1,585,000
Percentage of period-end gross financing receivables
Current (as a percent)	96.10%		93.40%
30-59 days past due (as a percent)	2.20%		3.50%
60-89 days past due (as a percent)	0.60%		1.50%
90 days or more past due (as a percent)	1.10%		1.60%
Total (as a percent)	100.00%		100.00%
Number of days past due for accounts to be put on non-accrual status (in days)	180