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Interest Rate Caps (Tables)
12 Months Ended
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Summary of Changes in Rate Caps
The following is a summary of changes in the rate caps:

 

     December 31,  
In thousands    2017      2016  

Balance at beginning of period

   $ 62      $ 120  

Purchases

     100        112  

Fair value adjustment included as an increase in interest expense

     (64      (170
  

 

 

    

 

 

 

Balance at end of period, included in other assets

   $ 98      $ 62