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Equity-Method Investment And Other Assets (Tables)
12 Months Ended
Dec. 31, 2017
Equity Method Investments And Other Assets [Abstract]  
Equity-Method Investment And Other Assets Disclosure [Table Text Block]
Our other assets consist of the following (in thousands):
 
As of December 31,
 
2017
 
2016
Accounts receivable and other assets
$
5,187

 
$
9,212

Regulatory escrows
8,208

 
8,208

Reserves for replacement, insurance and tax escrows
4,817

 
4,047

Marketable securities

 
11,745

 
$
18,212

 
$
33,212