Closing Stock Price Per Common Share

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- Definition

Amount represents the common stock closing price per share threshold, which if exceeded for a minimum of specified trading days in a consecutive specified trading day period ending on the last trading day of the preceding fiscal quarter, would convert the debt at the option of the holder.

+ Details

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- Definition

Contingent interest payment rate of the average trading price of the convertible notes if certain thresholds are met or events occur, as outlined in the debt indenture document.

+ Details

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- Definition

Represents the number of consecutive trading days required in which the closing sale price per share of the company's common stock exceeds a specific per share value for a specific number of trading days ending in the last trading day of the preceding fiscal quarter.

+ Details

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- Definition

Conversion Threshold Minimum Trading Days used to determine the amount payable upon conversion of the convertible secured subordinated note.

+ Details

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- Definition

Represents the threshold rate of the trading price of the convertible notes duriing a specified trading period.

+ Details

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- Definition

Rate prepresents the entities non-convertible debt borrowing rate at the time their convertible notes were issued, which also relfects the effective interest rate on the liability component.

+ Details

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- Definition

Ownership percentage of guarantor subsidiary of the Company.

+ Details

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- Definition

Percent of redemption price, which may be redeemed on the prinicpal amount of the convertible notes.

+ Details

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- Definition

Represents the principal amount of the convertible notes, which may be converted at the option of the holder at a specific conversion rate of the company's common stock shares.

+ Details

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- Definition

The percentage increase by which the closing price exceeds the conversion price.

+ Details

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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-Publisher FASB
-Name FASB Staff Position (FSP)
-Number APB14-1
-Paragraph 32
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

The ratio applied to the debt for purposes of determining the number of shares of the equity security into which the debt will be converted.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Conversion Rate
-URI http://asc.fasb.org/extlink&oid=6509012

+ Details

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- Definition

The effective interest rate on the liability component of convertible debt instrument which may be settled in cash upon conversion, including partial cash settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6036836-161870

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-Publisher FASB
-Name FASB Staff Position (FSP)
-Number APB14-1
-Paragraph 33
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 21
-Paragraph 16, 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Interest rate stated in the contractual debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

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Debt Convertible Senior Subordinated Notes Additional Information (Details) (USD $)									6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Option of the Holders [Member] Convertible Debt [Member] Senior Subordinated Notes [Member]	Jun. 30, 2011 Option of the Holders [Member] Convertible Debt [Member] Senior Subordinated Notes [Member] On August 1, 2011 [Member]	Jun. 30, 2011 Option of the Holders [Member] Convertible Debt [Member] Senior Subordinated Notes [Member] On August 1, 2016 [Member]	Jun. 30, 2011 Option of the Holders [Member] Convertible Debt [Member] Senior Subordinated Notes [Member] On August 1, 2021 [Member]	Jun. 30, 2011 Option of the Company [Member] Convertible Debt [Member] Senior Subordinated Notes [Member]	Jun. 30, 2011 Option of the Company [Member] Convertible Debt [Member] Senior Subordinated Notes [Member] On or After August 1, 2011 [Member]	Jun. 30, 2011 Convertible Debt [Member] Senior Subordinated Notes [Member]	Aug. 04, 2006 Convertible Debt [Member] Senior Subordinated Notes [Member]
Convertible Senior Subordinated Notes [Line Items]
Debt instrument, face amount	$ 223,604,000	$ 223,604,000								$ 345,000,000
Debt instrument, interest rate, stated percentage										2.50%
Contingent interest payment rate									0.19%
Debt instrument, convertible, conversion ratio									15.3478
Principal amount of convertible note for conversion rate									$ 1,000
Common stock closing price threshold for conversion									$ 78.19
Stock price exceeding conversion price									120.00%
Debt instrument, convertible, conversion price	$ 65.16								$ 65.16
Conversion threshold minimum trading days									20
Conversion threshold consecutive trading day period									30
Conversion threshold trading price of convertible note to conversion value									98.00%
Closing stock price per common share	$ 48.16
Percent of principal amount redemption price			100.00%	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%
Ownership percentage of subsidiary guarantor	100.00%
Estimated nonconvertible debt borrowing rate										7.38%
Debt Instrument, Convertible, Effective Interest Rate									7.38%