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Convertible Subordinated Notes Convertible Subordinated Notes (Liability and Equity Components) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Debt Instrument [Line Items]
Principal amount	$ 162,017us-gaap_LongTermDebt
Unamortized discount of liability component	(29,208)us-gaap_DebtInstrumentUnamortizedDiscount
Convertible subordinated notes
Debt Instrument [Line Items]
Principal amount	143,750us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleSubordinatedDebtMember
Unamortized discount of liability component	(29,208)us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleSubordinatedDebtMember
Carrying value of the liability component	114,542csv_ConvertibleSubordinatedNotesAggregateMaturity / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleSubordinatedDebtMember
Equity component carrying value	$ 17,973us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleSubordinatedDebtMember

X

- Definition

Convertible Subordinated Notes Aggregate Maturity

+ References

No definition available.

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X

- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399



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-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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X

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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

-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher SEC

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-Name Accounting Standards Codification

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