Schedule II Valuation of Qualifying Accounts and Reserves

12 Months Ended

Dec. 31, 2014

Schedule II Valuation and Qualifying Accounts and Reserves [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (In Thousands, Except Per Share Data)
Column A	Column B		Column C					Column D		Column E
			Charges To
	Balance At		Cost							Balance
	Beginning		And			Other				At End
Description	of Period		Expense			Accounts (1)		Deductions		of Period
Allowance for doubtful accounts:
Year ended December 31, 2014	$	1,028	$	466		$	—	$	232	$	1,262
Year ended December 31, 2013	829		(27		)	238		12		1,028
Year ended December 31, 2012	791		205			—		167		829

(1) Addition to allowance for doubtful accounts following acquisition of GTI.

See accompanying Report of Independent Registered Public Accounting Firm.