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Concentration of Credit Risk (Tables)

12 Months Ended

Dec. 31, 2014

An analysis of the changes in the allowance for doubtful accounts is presented as follows (in thousands):

	2014			2013			2012
Balance, beginning of year	$	252		$	206		$	357
Provisions for bad debts		50			147			-
Less: Write-offs and recoveries		(123	)		(101	)		(151	)
Balance, end of year	$	179		$	252		$	206