Schedule of Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2015

Valuation And Qualifying Accounts [Abstract]

Schedule Of Valuation And Qualifying Accounts Disclosure [Text Block]

Schedule II - Valuation Accounts
				Additions
			Balance at				Balance at
			Beginning	Charges to			End of
(in thousands)			of Period	Operations	Other	Deductions	Period
Year ended December 31, 2015:
	Allowance for doubtful accounts(1)	$	2,943	499	—	25	3,417
Year ended December 31, 2014:
	Allowance for doubtful accounts(1)	$	338	2,639	—	34	2,943
Year ended December 31, 2013:
	Allowance for doubtful accounts(1)	$	1,442	67	—	1,171	338
(1)	Deductions in the allowance for doubtful accounts represent write-offs, net of recoveries, of amounts determined to be
	uncollectible.