Property and Equipment

12 Months Ended

Dec. 31, 2020

Property Plant And Equipment [Abstract]

(7) Property and Equipment

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

	December 31,
	2020			2019
Transportation equipment	$	48,645		$	48,645
Computer equipment and purchased software		61,299			58,920
Furniture and equipment		10,460			10,464
Leasehold improvements		31,403			31,023
Internally developed software		9,917			9,849
Property and equipment, gross		161,724			158,901
Less: accumulated depreciation and amortization		(118,749	)		(108,747	)
Property and equipment, net	$	42,975		$	50,154

Included in transportation equipment is the Company’s corporate aircraft, including capitalizable costs related to the repairs to the aircraft, and aircraft-related equipment. As of December 31, 2020, the net carrying value of the aircraft and aircraft-related equipment was $30.0 million, net of $18.6 million of accumulated depreciation. As of December 31, 2019, the net carrying value of the aircraft and aircraft-related equipment was $32.6 million, net of $16.0 million of accumulated depreciation.

Depreciation and amortization expenses related to property and equipment were $11.4 million, $11.7 million, and $8.3 million for the years ended December 31, 2020, 2019, and 2018, respectively.