Schedule II Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2015

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, Net				Balance at End of Period
Year Ended December 31, 2015
Allowance for doubtful accounts	$	4,276	$	1,705	$	(1,674	)	*	$	4,307
Year Ended December 31, 2014
Allowance for doubtful accounts	$	931	$	1,195	$	2,150			$	4,276
Year Ended December 31, 2013
Allowance for doubtful accounts	$	1,378	$	1,440	$	(1,887	)	*	$	931

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