Commitments and Contingencies (Details) (USD $)	9 Months Ended
Sep. 30, 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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 25

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682

Name:	us-gaap_OperatingLeasesRentExpenseMinimumRentals
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration