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Short-Term Borrowings (Tables)

12 Months Ended

Dec. 31, 2018

Borrowings [abstract]

Disclosure Of Detailed Information About short term borrowings [Text Block]

		January 1, 2017				December 31, 2017				December 31, 2018
		(in thousands)
Unsecured borrowings		$	-				-				20,000
Secured borrowings		$	138,000				147,000				164,000
Unused credit lines		$	285,511				238,695				247,295
Interest rate			0.32 %~ 0.55 %				0.35 %~ 0.58 %				0.35 %~ 2.96 %

Disclosure Of Detailed Information About Reconciliation Of Liabilities Arising From Financing Activities [Text Block]

The reconciliation of liabilities to cash flows arising from financing activities was as follows:

		January 1, 2017				Cash flows				December 31, 2017				Cash flows				December 31, 2018
		(in thousands)
Short-term borrowings		$	138,000				9,000				147,000				37,000				184,000