| Summary of Significant Classes of Amortizable Intangible Assets | 
  The following tables provide a summary of our significant classes of amortizable intangible assets:  
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Cost  | 
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Accumulated Amortization  | 
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Net  | 
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Customer lists and contracts  | 
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Favorable and assigned leases  | 
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 — 
  
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Subscriber base and lists  | 
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224  | 
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Other amortizable intangible assets  | 
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 — 
  
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Cost  | 
   | 
    | 
Accumulated Amortization  | 
   | 
    | 
Net  | 
   | 
 
   | 
 | 
   | 
   | 
 | 
   | 
   | 
 | 
   | 
   | 
 
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Customer lists and contracts  | 
    | 
$  | 
24,186  | 
   | 
    | 
$  | 
(23,006  | 
)   | 
    | 
$  | 
1,180  | 
   | 
 
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    | 
   | 
19,978  | 
   | 
    | 
   | 
(19,704  | 
)   | 
    | 
   | 
274  | 
   | 
 
Favorable and assigned leases  | 
    | 
   | 
2,188  | 
   | 
    | 
   | 
(1,975  | 
)   | 
    | 
   | 
213  | 
   | 
 
Subscriber base and lists  | 
    | 
   | 
8,647  | 
   | 
    | 
   | 
(8,531  | 
)   | 
    | 
   | 
116  | 
   | 
 
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3,070  | 
   | 
    | 
   | 
(2,771  | 
)   | 
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   | 
299  | 
   | 
 
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   | 
2,052  | 
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    | 
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(2,044  | 
)   | 
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   | 
8  | 
   | 
 
Other amortizable intangible assets  | 
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   | 
1,411  | 
   | 
    | 
   | 
(1,352  | 
)   | 
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   | 
59  | 
   | 
 
|   | 
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|   | 
    | 
$  | 
61,532  | 
   | 
    | 
$  | 
(59,383  | 
)   | 
    | 
$  | 
2,149  | 
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