Debt Schedule of Convertible Debt (Details) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
3.75% Convertible Senior Subordinated Notes, due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 6,913
Remaining amortization period for the debt discount (in years)	10 years 183 days
Debt Instrument, Interest Rate, Effective Percentage	8.25%
4.00% Junior Subordinated Convertible Debentures, due 2033 [Member]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 117,659
Remaining amortization period for the debt discount (in years)	18 years
Debt Instrument, Interest Rate, Effective Percentage	8.01%
3.25% Convertible Senior Debentures, Due 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 233,901
Remaining amortization period for the debt discount (in years)	183 days
Debt Instrument, Interest Rate, Effective Percentage	7.63%
3.25% Convertible Senior Subordinated Exchange Debentures, due 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 25,259
Remaining amortization period for the debt discount (in years)	5 years 274 days
Debt Instrument, Interest Rate, Effective Percentage	5.24%
3.5% Convertible senior subordinated debt [Domain]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 208,200
Remaining amortization period for the debt discount (in years)	28 years 237 days
Debt Instrument, Interest Rate, Effective Percentage	7.70%

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

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)

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- Definition

Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (a)

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: 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

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

-Publisher FASB

-Name Accounting Standards Codification

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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.

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