Schedule II Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2013

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

	Balance at Beginning of Period		Provision for (Recovery of) Bad Debt			Deductions/ Write-Offs and Other Charges				Balance at End of Period
Year Ended December 31, 2013
Allowance for doubtful accounts	$	1,378	$	1,440		$	(1,887	)	*	$	931
Year Ended December 31, 2012
Allowance for doubtful accounts	$	3,092	$	(1,265	)	$	(449	)	*	$	1,378
Year Ended December 31, 2011
Allowance for doubtful accounts	$	8,321	$	338		$	(5,567	)	*	$	3,092

* Amounts represent primarily the write-off of certain uncollectible trade receivables that had previously been fully reserved.