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Supplementary Information Schedule Of Cash Flow Supplementa lDisclosures (Tables)
12 Months Ended
Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Cash interest payments for the three years ended December 31 were as follows (in thousands):
Payments in 2019
$
190,672

Payments in 2018
$
179,865

Payments in 2017
$
160,843