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Property and Equipment
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment 

Property and equipment at December 31, 2015 and 2014 consisted of the following (in thousands):  
 
2015
 
2014
Computer equipment
$
8,148

 
$
7,454

Software, including internal use software
59,718

 
48,731

Office equipment and furniture
4,778

 
4,099

Leasehold improvements
2,498

 
1,902

 
75,142

 
62,186

Less accumulated depreciation
(42,461
)
 
(32,422
)
 
$
32,681

 
$
29,764


 
Depreciation expense was $11.7 million, $10.4 million and $6.7 million for the years ended December 31, 2015, 2014 and 2013, respectively.