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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2015
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
3-4 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,
 
2015
 
2014
 
(In thousands)
Land
$
205

 
$
205

Building
605

 
605

Computer equipment, furniture, and office equipment
45,508

 
45,525

Computer software purchased
16,900

 
20,363

Capitalized internal-use software
113,721

 
89,023

Tenant improvements
9,914

 
9,172

 
186,853

 
164,893

Less accumulated depreciation and amortization
(107,976
)
 
(87,609
)
Property and equipment, net
$
78,877

 
$
77,284