As of December 31, 2016, 2017 and 2018, the machinery, equipment and improvements on leased assets are comprised as follows:

	Balance as of January 1, 2016		Additions		Divestitures			Currency translation effect		Balance as of December 31, 2016
Investment:
Machinery and equipment	Ps.	1,907,231	Ps.	155,957	Ps.	(16,257	)	Ps.	134,374	Ps.	2,181,305
Office furniture and equipment		174,688		39,878		(14,182	)		8,292		208,676
Computer equipment		508,373		90,195		(28,346	)		26,430		596,652
Transportation equipment		36,847		4,081		(1,000	)		2,109		42,037
Communication equipment		28,528		1,904		(2,208	)		—		28,224
Improvements on leased buildings		16,473		24,985		—			—		41,458
Total investment		2,672,140		317,000		(61,993	)		171,205		3,098,352

	Balance as of January 1, 2016			Additions			Divestitures			Currency translation effect			Balance as of December 31, 2016
Accumulated depreciation:
Machinery and equipment		(681,636	)		(189,241	)		15,838			(71,797	)		(926,836	)
Office furniture and equipment		(100,130	)		(10,238	)		12,330			(10,015	)		(108,053	)
Computer equipment		(293,648	)		(86,520	)		27,888			(24,753	)		(377,033	)
Transportation equipment		(23,172	)		(5,469	)		1,000			(2,733	)		(30,374	)
Communication equipment		(13,112	)		(2,879	)		1,710			—			(14,281	)
Improvements on leased buildings		(4,849	)		(6,533	)		—			—			(11,382	)
Total accumulated depreciation		(1,116,547	)		(300,880	)		58,766			(109,298	)		(1,467,959	)
Net amounts	Ps.	1,555,593		Ps.	16,120		Ps.	(3,227	)	Ps.	61,907		Ps.	1,630,393

	Balance as of January 1, 2017			Additions			Divestitures			Currency translation effect			Balance as of December 31, 2017
Investment:
Machinery and equipment	Ps.	2,181,305		Ps.	175,457		Ps.	(49,970	)	Ps.	(37,872	)	Ps.	2,268,920
Office furniture and equipment		208,676			40,958			(6,427	)		(2,309	)		240,898
Computer equipment		596,652			136,915			(12,751	)		(10,232	)		710,584
Transportation equipment		42,037			6,650			(1,220	)		(399	)		47,068
Communication equipment		28,224			2,386			(178	)		—			30,432
Improvements on leased buildings		41,458			30,140			—			—			71,598
Total investment		3,098,352			392,506			(70,546	)		(50,812	)		3,369,500
Accumulated depreciation:
Machinery and equipment		(926,836	)		(195,382	)		33,308			17,339			(1,071,571	)
Office furniture and equipment		(108,053	)		(16,363	)		5,641			1,682			(117,093	)
Computer equipment		(377,033	)		(101,207	)		11,373			7,354			(459,513	)
Transportation equipment		(30,374	)		(5,960	)		1,220			556			(34,558	)
Communication equipment		(14,281	)		(2,629	)		134			—			(16,776	)
Improvements on leased buildings		(11,382	)		(2,919	)		—			—			(14,301	)
Total accumulated depreciation		(1,467,959	)		(324,460	)		51,676			26,931			(1,713,812	)

Net amounts	Ps.	1,630,393		Ps.	68,046		Ps.	(18,870	)	Ps.	(23,881	)	Ps.	1,655,688

	Balance as of January 1, 2018			Additions			Divestitures			Currency translation effect			Balance as of December 31, 2018
Investment:
Machinery and equipment	Ps.	2,268,920		Ps.	444,495		Ps.	(62,642	)	Ps.	15,759		Ps.	2,666,532
Office furniture and equipment		240,898			61,414			(1,455	)		469			301,326
Computer equipment		710,584			107,381			(9,104	)		5,602			814,463
Transportation equipment		47,068			13,537			(3,072	)		562			58,095
Communication equipment		30,432			1,633			(911	)		—			31,154
Improvements on leased buildings		71,598			3,995			(4,010	)		—			71,583
Total investment		3,369,500			632,455			(81,194	)		22,392			3,943,153
Accumulated depreciation:
Machinery and equipment		(1,071,571	)		(221,674	)		55,770			(2,229	)		(1,239,704	)
Office furniture and equipment		(117,093	)		(20,839	)		1,864			(197	)		(136,265	)
Computer equipment		(459,513	)		(135,272	)		9,054			(305	)		(586,036	)
Transportation equipment		(34,558	)		(8,177	)		3,066			(190	)		(39,859	)
Communication equipment		(16,776	)		(2,354	)		786			—			(18,344	)
Improvements on leased buildings		(14,301	)		(3,328	)		917			—			(16,712	)
Total accumulated depreciation		(1,713,812	)		(391,644	)		71,457			(2,921	)		(2,036,920	)
Net amounts	Ps.	1,655,688		Ps.	240,811		Ps.	(9,737	)	Ps.	19,471		Ps.	1,906,233

As of December 31, 2016, 2017 and 2018, the net balances of machinery, equipment and improvements on leased assets are:

The Company has several buildings under operating leasing for office use. In Note 33, the costs and obligations under these leases are disclosed.