Schedule II - Valuation and Qualifying Accounts Schedule II Valuation and Qualifying Accounts (Notes)

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

Schedule II -Valuation and Qualifying Accounts

The roll forward of valuation accounts were as follows:

	(Dollars in thousands)
Description	Balance at Beginning of Period		Charged to Costs and Expenses			Deductions				Balance at End of Period
Allowance for doubtful accounts:
Year ended December 31, 2017	$	454	$	499		$	(477	)	(1)	$	476
Year ended December 31, 2016	543		361			(450		)	(1)	454
Year ended December 31, 2015	733		353			(543		)	(1)	543
Valuation allowance for deferred tax assets:
Year ended December 31, 2017	$	35,416	$	(32,860	)	$	—			$	2,556
Year ended December 31, 2016	36,516		(1,100		)	—				35,416
Year ended December 31, 2015	36,675		(159		)	—				36,516

(1) Uncollected receivables written off, net of recoveries and translation adjustments.