Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Schedule of Allowance for Doubtful Accounts

Activity in the allowance for doubtful accounts was as follows:

	2012			2011			2010
Balance, beginning of year	$	4,391		$	5,742		$	7,213
Net charges to costs and expenses	364			18			624
Write-offs, net of recoveries	(2,037		)	(1,319		)	(2,039		)
Foreign currency translation	33			(50		)	(56		)
Balance, end of year	$	2,751		$	4,391		$	5,742