Commitments and Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitment And Contingencies [Line Items]
Option to renewal description	The Company's primary office lease has the option to renew the lease for two successive periods of five years each.
Deferred rent and rent incentives	$ 1,548us-gaap_DeferredRentCredit	$ 1,304us-gaap_DeferredRentCredit
Deferred rent and rent incentives, noncurrent	1,483us-gaap_DeferredRentCreditNoncurrent	1,261us-gaap_DeferredRentCreditNoncurrent
Rent expense	6,280us-gaap_LeaseAndRentalExpense	5,328us-gaap_LeaseAndRentalExpense	4,197us-gaap_LeaseAndRentalExpense
Income from sublease rental	0	0	88
Total capital lease obligation assumed	2,899
Total assets under capital leases	2,664us-gaap_CapitalLeasedAssetsGross
Assets under capital leases, accumulated amortization	1,015
Non-cancelable commitments due in 2015	9,071
Non-cancelable commitments due in 2016	8,000
Non-cancelable commitments due in 2017	8,000
Letter of Credit [Member]
Commitment And Contingencies [Line Items]
Debt instrument, face amount	$ 2,404

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Operating Leases Renewal Option Description

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- Definition

Amount of capital lease obligation, assumed at the acquisition date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

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- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

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The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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Face (par) amount of debt instrument at time of issuance.

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The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

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For a classified balance sheet, the cumulative difference between the rental income or payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, more than one year after the balance sheet date.

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

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- Definition

The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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