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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Estimated Useful Life for Property and Equipment
Asset Category
 
Years
Computer hardware
 
3
Computer software
 
3 to 5
Internally developed software
 
5
Furniture and fixtures
 
10
Buildings and improvements
 
5 to 40