Property and Equipment

12 Months Ended

Dec. 31, 2018

Property Plant And Equipment [Abstract]

(6) Property and Equipment

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

	December 31,
	2018			2017
Transportation equipment	$	48,645		$	48,645
Computer equipment and purchased software		56,933			57,515
Furniture and equipment		10,709			10,425
Leasehold improvements		29,733			28,511
Internally developed software		9,643			9,643
Property and equipment, gross		155,663			154,739
Less: accumulated depreciation and amortization		(103,744	)		(101,380	)
Property and equipment, net	$	51,919		$	53,359

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, 2018, the net carrying value of the aircraft and aircraft-related equipment was $35.2 million, net of $13.4 million of accumulated depreciation. As of December 31, 2017, the net carrying value of the aircraft and aircraft-related equipment was $36.9 million, net of $11.7 million of accumulated depreciation. During the fourth quarter of 2018, the Company changed the estimated useful life and salvage value of its owned corporate aircraft. These changes in estimates were accounted for prospectively. See Note 2, Summary of Significant Accounting Policies to the consolidated financial statements for further detail on these changes in estimates. These changes in estimates did not have a material impact on the Company’s consolidated financial statements for the year ended December 31, 2018.

Depreciation and amortization expense related to property and equipment, including assets under capital leases, was $8.3 million, $8.4 million, and $10.6 million for the years ended December 31, 2018, 2017, and 2016, respectively.