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Other Assets (Tables)
 6 Months Ended
Jun. 30, 2018
Other Assets [Abstract]  
Schedule of Other Assets [Table Text Block]
Other assets consist of the following (in thousands):
 
June 30,
2018
 
December 31,
2017
Accounts receivable and other assets
$
9,709

 
$
5,187

Regulatory escrows
8,208

 
8,208

Reserves for replacement, insurance and tax escrows
5,209

 
4,817

 
$
23,126

 
$
18,212