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Property and Equipment | 12 Months Ended
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Dec. 31, 2018
Property Plant And Equipment [Abstract] |
Property and Equipment | (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.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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