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Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2014

Activity in the allowance for doubtful accounts was as follows:


	Years ended December 31,
	2014			2013			2012
Balance, beginning of year	$	3,686		$	3,780		$	4,585
Provision (net of recovery)		(306	)		1,001			(23	)
Amounts written off, net of recoveries		(1,536	)		(1,095	)		(782	)

Balance, end of year	$	1,844		$	3,686		$	3,780