Committed Lines of Credit (Tables)

9 Months Ended

Sep. 30, 2016

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities [Table Text Block]

Balances outstanding and interest rates of borrowings (excluding letters of credit) under the Company’s revolving committed lines of credit were as follows as of September 30, 2016 and December 31, 2015 (dollars in thousands):

	September 30,			December 31,
	2016			2015
Borrowings outstanding at end of period (1)	$	187,000		$	105,000
Letters of credit outstanding at end of period	$	73,195		$	44,595
Average interest rate on borrowings at end of period	1.26		%	1.18		%