Property and Equipment, net

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment [Abstract]

Property and Equipment, net

Property and Equipment, net

Property and equipment consisted of: 

(Dollar amounts in thousands)	Estimated Useful Lives				December 31, 2012			December 31, 2013
Computers, software and equipment	1	-	5	years	$	1,140,772		$	1,488,106
Furniture and fixtures	7	years			40,557			55,681
Buildings and leasehold improvements	2	-	30	years	214,858			236,255
Land					15,864			28,566
Property and equipment, at cost					1,412,051			1,808,608
Less accumulated depreciation and amortization					(738,274		)	(983,618		)
Work in process					51,208			65,786
Property and equipment, net					$	724,985		$	890,776

Depreciation and leasehold amortization expense, not including amortization expense for intangible assets, was $189.8 million, $240.9 million and $303.2 million for the years ended December 31, 2011, 2012 and 2013, respectively.

At December 31, 2012, the work in process balance consisted of build outs of $28.4 million for office facilities, $2.8 million for data centers, and $20.0 million for capitalized software and other projects. At December 31, 2013, the work in process balance consisted of build outs of $32.6 million for office facilities, $2.4 million for data centers, and $30.7 million for capitalized software and other projects.

The unamortized balance of computer software costs on our balance sheets was $78.7 million and $88.7 million as of December 31, 2012 and 2013, respectively. Amortization expense for capitalized computer software costs was $26.2 million, $36.4 million and $50.6 million for the years ended December 31, 2011, 2012 and 2013, respectively.