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Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
The following table summarizes the notional amounts of the Company's outstanding interest rate swap and cap agreements:
 
March 31,
 
December 31,
 
2018
 
2017
Interest rate swap contracts
$
75,000

 
$
75,000

Interest rate cap contracts
$
75,000

 
$
75,000