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Summary of Significant Accounting Policies Property & Equipment Estimated Useful Lives (Tables)
12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment Estimated Useful Life [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 years
Tenant improvements
Shorter of the useful life or the lease term
Property and equipment consisted of the following:
 
December 31,
 
2012
 
2011
 
(In thousands)
Land
$
205

 
$
205

Building
543

 
568

Computer equipment, furniture, and office equipment
23,690

 
17,119

Computer software purchased
10,914

 
6,284

Capitalized internal-use software
52,501

 
29,673

Tenant improvements
7,076

 
2,182

 
94,929

 
56,031

Less accumulated depreciation and amortization
(36,553
)
 
(28,750
)
Property and equipment, net
$
58,376

 
$
27,281