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Committed Lines of Credit (Tables)
3 Months Ended
Mar. 31, 2019
Short-term Debt [Abstract]  
Schedule of Line of Credit Facilities [Table Text Block]
outstanding and interest rates of borrowings (excluding letters of credit) under the Company’s revolving committed line of credit were as follows as of March 31, 2019 and December 31, 2018 (dollars in thousands):
 
March 31,
 
December 31,
 
2019
 
2018
Balance outstanding at end of period (1)
$
119,000

 
$
190,000

Letters of credit outstanding at end of period
$
60,103

 
$
10,503

Average interest rate at end of period
3.31
%
 
3.18
%