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Property and Equipment
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment
The components of property and equipment are:
 
 
December 31,
2014
 
2013
(in thousands)
Land and land improvements
$
3,107

 
$
2,490

Facilities in progress and software under development
10,408

 
6,435

Computer equipment and software
99,306

 
83,089

Buildings and leasehold improvements
37,013

 
38,403

Furniture, fixtures and equipment
15,326

 
16,371

Assets under capital lease
4,827

 
3,468

 
169,987

 
150,256

Less: Accumulated depreciation and amortization
(92,678
)
 
(82,404
)
Property and equipment, at cost, net
$
77,309

 
$
67,852


As facilities in progress and software development are completed and placed in service, they are transferred to appropriate property and equipment categories and depreciation begins. Interest capitalized as a cost of property and equipment totaled $0.4 million for the year ended December 31, 2014.
Unamortized capitalized software development costs at December 31, 2014 and 2013 totaled $25.2 million and $15.9 million, respectively. Amortization of software development costs for the years ended December 31, 2014, 2013 and 2012 totaled $6.3 million, $3.8 million and $3.3 million, respectively.
Depreciation has been computed for financial reporting purposes using the straight-line method. A summary of the ranges of estimated useful lives upon which depreciation rates are based follows:
Computer equipment and software
2-5 years
Buildings and leasehold improvements
5-40 years
Furniture, fixtures and equipment
3-15 years
Assets under capital leases
3 - 8 years

Depreciation expense, excluding amounts attributable to marketing and reservation activities, for the years ended December 31, 2014, 2013 and 2012 was $3.1 million, $3.2 million and $2.4 million, respectively. Accumulated amortization of capital leases, included in accumulated depreciation and amortization above, at December 31, 2014 and 2013 totaled $2.0 million and $1.4 million, respectively.