Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
Dec. 31, 2014 institution	Dec. 31, 2013 institution
Operations [Line Items]
Number of financial institutions giving rise to concentration risk	1	1
Uninsured balances of cash, cash equivalents and restricted cash	$ 5,100,000us-gaap_CashUninsuredAmount	$ 5,100,000us-gaap_CashUninsuredAmount
Impairments of internal use software		400,000
Deferred tax assets	269,592,000us-gaap_DeferredTaxAssetsGross	284,136,000us-gaap_DeferredTaxAssetsGross
Cash and Cash Equivalents \| Deposit Concentration Risk
Operations [Line Items]
Concentration risk, percentage	50.00%	80.00%
Other Assets \| Cash
Operations [Line Items]
Restricted cash	$ 600,000	$ 600,000

Financial Institutions Where Cash, Cash Equivalents And Restricted Cash Is Held

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- Definition

For each income statement presented, the amount charged to expense for write-downs of capitalized computer software costs to net realizable value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756

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-Paragraph 1

-Subparagraph (b)

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The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Deferred Tax Asset

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- Definition

Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

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-Name Accounting Standards Codification

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-Section S99

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-Subparagraph (SX 210.5-02.1)

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