Property and Equipment

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

The components of property and equipment are:



	December 31,
	2016			2015
	(in thousands)
Land and land improvements	$	3,107		$	3,107
Facilities in progress and software under development	19,825			21,089
Computer equipment and software	132,610			117,762
Buildings and leasehold improvements	37,232			37,205
Furniture, fixtures and equipment	16,919			17,158
Assets under capital lease	4,827			4,827
	214,520			201,148
Less: Accumulated depreciation and amortization	(130,459		)	(112,990		)
Property and equipment, at cost, net	$	84,061		$	88,158

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 $0.3 million for the years ended December 31, 2016 and 2015.

Unamortized capitalized software development costs at December 31, 2016 and 2015 totaled $37.8 million and $34.7 million, respectively. Amortization of software development costs for the years ended December 31, 2016, 2015 and 2014 totaled $11.8 million, $9.6 million and $6.3 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	2-7 years
Buildings and leasehold improvements	10-40 years
Furniture, fixtures and equipment	3-8 years
Assets under capital leases	3-8 years

Depreciation expense, excluding amounts attributable to marketing and reservation activities, for the years ended December 31, 2016, 2015 and 2014 was $5.6 million, $4.3 million and $3.1 million, respectively. Accumulated amortization of capital leases, included in accumulated depreciation and amortization above, at December 31, 2016 and 2015 totaled $3.8 million and $2.9 million, respectively.