Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2012

Allowance for Doubtful Accounts [Roll Forward]

Schedule Of Allowance For Doubtful Accounts Table Text Block

	Year ended December 31,
	2012			2011			2010
Balance, beginning of year	$	1,057		$	228		$	315
Charges (reductions) to expense		744			1,037			(68	)
Uncollected balances written off, net of recoveries		(1,077	)		(208	)		(19	)
Balance, end of year	$	724		$	1,057		$	228