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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Useful Lives for Principal Classes of Assets | The ranges of useful lives for the principal classes of assets are as follows:
Buildings and improvements |  | 10 to 30 years
Furniture and equipment |  | 3 to 10 years
Leasehold improvements |  | Term of lease or useful life, whichever is shorter
Software |  | 3 years

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