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Other Assets (Tables)
 6 Months Ended
Jun. 30, 2017
Other Assets [Abstract]  
Schedule of Other Assets [Table Text Block]
Other assets consist of the following (in thousands):
 
June 30,
2017
 
December 31,
2016
Accounts receivable and other assets
$
3,753

 
$
9,017

Regulatory deposits
8,208

 
8,208

Reserves for replacement, insurance and tax escrows
4,419

 
4,046

Marketable securities
—

 
11,745

 
$
16,380

 
$
33,016