Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Advertising costs for the years ended December 31, 2016, 2015 and 2014, are reflected in the following table (in thousands):



	Years Ended December 31,
	2016		2015		2014
Advertising Costs	$	47,312	$	44,015	$	42,335

Depreciation Expense Computed Using Straight-Line Method over Useful Lives

Depreciation expense is computed using the straight-line method over the following useful lives:



Computer hardware	2 to 3 years
Computer software	2 to 5 years
Furniture and equipment	5 years
Leasehold improvements	Term of lease, 5 years maximum

Property and equipment consisted of the following (in thousands):



	December 31,
	2016			2015
Computer hardware	$	170,746		$	162,346
Computer software	374,490			339,634
Furniture and equipment	100,472			96,536
Leasehold improvements	133,541			118,491
Other	9,993			9,560
Property and equipment, cost	789,242			726,567
Accumulated depreciation	(627,733		)	(583,661		)
Property and equipment, net	$	161,509		$	142,906

Internal-Use Software Development Costs Capitalized

Internal-use software development costs capitalized for the years ended December 31, 2016, 2015 and 2014, are reflected in the following table (in thousands):



	Years Ended December 31,
	2016		2015		2014
Internal-use software development costs	$	33,753	$	31,964	$	24,367