Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2014

Receivables [Abstract]

Allowance for Doubtful Debts

In order to provide for these collection problems and the general risk associated with the granting of credit terms, we have recorded the following bad debt provisions (in an Allowance for Doubtful Accounts):

	Year Ended December 31,
	2014		2013		2012
Bad debt provision	$	4,470,000	$	1,990,000	$	2,160,000

Impaired Notes Receivable

Summary schedules of impaired notes receivable, and the related reserve, for the years ended December 31, 2014, 2013 and 2012 are as follows:

	Impaired Notes Receivable
Year ended December 31,	Balance Beginning of Year		Additions		Deductions		Balance End of Year		Average Outstanding Balance
2014	$	2,892,000	$	9,124,000	$	1,808,000	$	10,208,000	$	6,550,000
2013	$	1,639,000	$	1,267,000	$	14,000	$	2,892,000	$	2,266,000
2012	$	1,855,000	$	—	$	216,000	$	1,639,000	$	1,747,000

Reserve for Impaired Notes Receivable

	Reserve for Impaired Notes Receivable
Year ended December 31,	Balance Beginning of Year		Additions		Deductions		Balance End of Year
2014	$	2,019,000	$	2,489,000	$	1,477,000	$	3,031,000
2013	$	958,000	$	1,072,000	$	11,000	$	2,019,000
2012	$	1,066,000	$	108,000	$	216,000	$	958,000