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Committed Lines of Credit (Tables)
12 Months Ended
Dec. 31, 2018
Short-term Debt [Abstract]  
Schedule of Line of Credit Facilities [Table Text Block]
 
2018
 
2017
Balance outstanding at end of period
$
190,000

 
$
105,000

Letters of credit outstanding at end of period
$
10,503

 
$
34,420

Average interest rate at end of period
3.18
%
 
2.26
%