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Note 5 - Property and Equipment
 12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]
5
.     PROPERTY AND EQUIPMENT
 
A summary of property and equipment,
at cost, as of
December 31, 2017
and
2016
is as follows:
 
(in thousands)
  
Estimated
Useful Lives
(in years)
    
 
2017
    
 
2016
  
Revenue equipment
    
3
-
10
     $
519,797
     $
499,809
  
Communications equipment
    
5
-
10
      
4,585
      
8,192
  
Land and improvements
    
0
-
10
      
25,061
      
24,979
  
Buildings and leasehold improvements
    
7
-
40
      
74,513
      
71,827
  
Construction in-progress
    
 
-
 
      
2,023
      
3,176
  
Other
    
2
-
7
      
25,009
      
23,093
  
     
 
 
 
     $
650,988
     $
631,076
  
 
Depreciation expense was
$72.4
million,
$71.4
million, and
$61.9
million, in
2017,
2016,
and
2015,
respectively. This depreciation expense excludes net losses on the sale of property and equipment totaling
$4.0
million and
$0.8
million in
2017
and
2016,
respectively, and net gains on the sale of property and equipment totaling
$0.6
million in
2015,
which are presented net in depreciation and amortization expense in the consolidated statements of operations.
 
We lease certain rev
enue equipment under capital leases with terms of approximately
60
to
84
months. At
December 31, 2017
and
2016,
property and equipment included capitalized leases, which had capitalized costs of
$30.5
million and
$26.6
million and accumulated amortization of
$5.4
million and
$4.2
million, respectively. Amortization of these leased assets is included in depreciation and amortization expense in the consolidated statement of operations and totaled
$2.6
million,
$1.6
million, and
$2.0
million during
2017
,
2016,
and
2015,
respectively.