Note 3. Plant, Property and Equipment, Net

Plant, property and equipment consisted of the following:

	September 30, 2017			December 31, 2016
	(in millions)
Distribution facilities	$	1,447.5		$	1,336.4
Customer premise equipment	376.1			376.9
Head-end equipment	316.3			299.9
Telephony infrastructure	127.7			123.8
Computer equipment and software	101.3			95.4
Vehicles	34.9			32.1
Buildings and leasehold improvements	43.9			44.9
Office and technical equipment	32.5			36.2
Land	6.2			6.7
Construction in progress (including material inventory and other)	125.4			110.5

Total plant, property and equipment	2,611.8			2,462.8
Less accumulated depreciation	(1,569.8		)	(1,467.7		)

Plant, Property and Equipment, Net	$	1,042.0		$	995.1

Depreciation expense for the three months ended September 30, 2017 and 2016 was $48.4 million and $48.1 million, respectively. Depreciation expense for the nine months ended September 30, 2017 and 2016 was $148.6 million and $142.2 million, respectively. Included in depreciation expense were gains (losses) on write-offs or sales of head-end and customer premise equipment totaling nil and $0.1 million for the three months ended September 30, 2017 and 2016, respectively; and $0.3 million and $0.4 million for the nine months ended September 30, 2017 and 2016.

Assets Held for Sale

On August 1, 2017, the Company entered into a definitive agreement to sell a portion of its fiber network in the Company’s Chicago market to a subsidiary of Verizon for $225.0 million in cash. The Company anticipates the sale to be completed in the fourth quarter of 2017. In addition, at the closing of the definitive agreement, the Company and Verizon will enter into a new agreement pursuant to which the Company will complete the build-out of the network in exchange for approximately $50.0 million, which represented the estimated remaining build-out costs to complete the network at the time the definitive agreement was entered into. The $50.0 million will be payable as such network elements are completed. The Company anticipates such network would be completed in the second half of 2018.

As a result of the definitive agreement, the Company concluded that as of September 30, 2017, the assets and liabilities associated with the fiber network met the criteria to be classified as held for sale. As of September 30, 2017, the Chicago fiber network has $149.2 million in total assets and $15.5 million in total liabilities held for sale that are included in the Company’s unaudited condensed consolidated balance sheets which includes approximately $7.0 million the Company has spent on construction subsequent to the signing of the definitive agreement on August 1, 2017.