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Property and Equipment
 12 Months Ended
Dec. 31, 2017
Property Plant And Equipment [Abstract]  
Property and Equipment

(7) Property and Equipment

Property and equipment (in thousands) consisted of the following, as of:

 

 

 

December 31,

 

 

 

2017

 

 

2016

 

Transportation equipment

 

$

48,645

 

 

$

48,835

 

Computer equipment and purchased software

 

 

57,515

 

 

 

60,692

 

Furniture and equipment

 

 

10,425

 

 

 

10,871

 

Leasehold improvements

 

 

28,511

 

 

 

27,737

 

Internally developed software

 

 

9,643

 

 

 

9,655

 

Property and equipment, gross

 

 

154,739

 

 

 

157,790

 

Less: accumulated depreciation and amortization

 

 

(101,380

)

 

 

(100,354

)

Property and equipment, net

 

$

53,359

 

 

$

57,436

 

 

Included in transportation equipment is the Company’s owned corporate aircraft, including capitalizable costs related to the repairs to the aircraft, and aircraft-related equipment.  As of December 31, 2017, the net asset value of the aircraft and aircraft-related equipment was $36.9 million, net of $11.7 million of accumulated depreciation.  As of December 31, 2016, the net asset value of the aircraft and aircraft-related equipment was $38.4 million, net of $10.2 million of accumulated depreciation.

Included in computer equipment at December 31, 2017 and 2016 is $0.6 million and $2.2 million, respectively, acquired under capital lease arrangements.  At December 31, 2017 and 2016, accumulated amortization relating to computer equipment under capital lease arrangements totaled $0.6 million and $2.2 million, respectively.

Depreciation and amortization expense related to property and equipment, including assets under capital leases, was $8.4 million, $10.6 million, and $14.0 million for the years ended December 31, 2017, 2016, and 2015, respectively.