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Derivatives (Tables)
 6 Months Ended
Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Interest Rate Derivatives [Table Text Block]
Information pertaining to outstanding interest rate caps is as follows:
Aggregate Notional Amount (in millions)Start DateEnd DateOffsets Variable Rate Debt Attributable to Fluctuations Above:
$100November 9, 2017December 31, 2020
Three Month LIBOR of 3.5%
$100November 9, 2017December 31, 2020
Three Month LIBOR of 3.5%
$100November 21, 2017December 31, 2020
Three Month LIBOR of 3.5%