Property and Equipment

12 Months Ended

Dec. 31, 2014

4. Property and Equipment

The amount of property and equipment and their respective estimated useful lives are as follows (in thousands, except estimated useful lives):


	As of December 31,				Estimated
	2014		2013		Useful Lives
Land	$	17,333	$	4,653	Indefinite
Buildings and leasehold improvements		43,356		20,299	3 - 40 years
Office equipment, furniture and fixtures		13,636		8,629	3 - 10 years
Computer equipment and software costs		102,713		88,077	3 - 10 years
Machinery, equipment and vehicles		132,469		92,364	3 - 40 years
		309,507		214,022
Accumulated depreciation and amortization		106,791		84,337
	$	202,716	$	129,685

For 2014, 2013 and 2012, we recorded depreciation expense of $30.3 million, $22.0 million and $18.6 million, respectively.

The amount of computer software costs, including capitalized internally developed software costs are as follows (in thousands):


	As of December 31,
	2014		2013
Computer software costs	$	76,870	$	67,366
Accumulated amortization		45,234		35,499
Computer software costs, net	$	31,636	$	31,867

Included in capitalized computer software costs are costs incurred in connection with software development in progress of $4.7 million and $6.0 million as of December 31, 2014 and 2013, respectively. For 2014, 2013 and 2012, we recorded amortization expense related to computer software costs of $9.8 million, $7.8 million and $7.2 million, respectively.

The assets and accumulated amortization recorded under capital leases are as follows (in thousands):


	As of December 31,
	2014		2013
Capital leases	$	17,658	$	5,268
Accumulated amortization		5,484		1,869
Capital leases, net	$	12,174	$	3,399

- 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.

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