| Property, Plant and Equipment Components |
The components of our property, plant and equipment are as follows: | | | | | | | | | | December 31, | | 2014 | | 2013 | | (in thousands) | Land | $ | 6,777 |
| | $ | 7,663 |
| Building and leasehold improvements | 137,235 |
| | 190,258 |
| Network equipment, communication towers and network software | 4,074,786 |
| | 4,735,361 |
| Software, office equipment, furniture and fixtures and other | 678,300 |
| | 753,665 |
| Corporate aircraft | — |
| | 42,747 |
| Less: Accumulated depreciation and amortization | (2,669,566 | ) | | (2,907,939 | ) | | 2,227,532 |
| | 2,821,755 |
| Construction in progress | 205,401 |
| | 515,790 |
| | $ | 2,432,933 |
| | $ | 3,337,545 |
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