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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Property and equipment
The estimated useful lives of the respective classes of assets are as follows:
Land
N/A
Building
30 years
Computer equipment, furniture and office equipment
3-10 years
Computer software purchased
3 years
Capitalized internal-use software
2-7 years
Tenant improvements
Shorter of the useful life or the lease term
Property and equipment consisted of the following:
 
December 31,
 
2017
 
2016
 
(In thousands)
Land
$
205

 
$
205

Building
1,105

 
1,105

Computer equipment, furniture, and office equipment
52,132

 
44,789

Computer software purchased
25,579

 
19,370

Capitalized internal-use software
157,477

 
139,730

Tenant improvements
10,030

 
10,101

 
246,528

 
215,300

Less accumulated depreciation and amortization
(149,246
)
 
(132,679
)
Property and equipment, net
$
97,282

 
$
82,621