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Commitments and Contingencies (Details) (USD $)	3 Months Ended
Commitments and Contingencies (Details) (USD $)	Mar. 31, 2013 lease
Lease Commitments
Number of operating leases	2
Corporate headquarters
Lease Commitments
Irrevocable standby letter of credit provided to landlord	785,000
Corporate headquarters \| Low end of range
Lease Commitments
Aggregate annual cash payments	2,400,000
Corporate headquarters \| High end of range
Lease Commitments
Aggregate annual cash payments	2,500,000
Off-site back-up facility \| Low end of range
Lease Commitments
Aggregate annual cash payments	28,000
Off-site back-up facility \| High end of range
Lease Commitments
Aggregate annual cash payments	30,000

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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