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Senior and Convertible Senior Notes (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Jun. 02, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Senior Notes |  | $ 1,104,060 |  | $ 904,486
Senior Notes [Member] | 4.50% senior notes due 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 175,000 |  | $ 175,000
Debt instrument, stated rate (percentage) |  | 4.50% |  | 4.50%
Senior Notes [Member] | 7.15% senior notes due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 302,560 |  | $ 302,986
Debt instrument, stated rate (percentage) |  | 7.15% |  | 7.15%
Unamortized premium |  | $ 2,560 |  | $ 2,986
Senior Notes [Member] | 7.00% senior notes due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 300,000 |  | $ 300,000
Debt instrument, stated rate (percentage) |  | 7.00% |  | 7.00%
Senior Notes [Member] | 6.00% senior notes due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 200,000 |  | $ 0
Debt instrument, stated rate (percentage) |  | 6.00% | 6.00% |
Senior Notes [Member] | 1.875% convertible senior notes due 2032 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | [1] | $ 126,500 |  | $ 126,500
Debt instrument, stated rate (percentage) |  | 1.875% |  | 1.875%
[1] | The Convertible Notes may be redeemed by the note-holders on the fifth, tenth and fifteenth anniversary dates of the issuance date of the Convertible Notes.

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 + Details
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- Definition The amount of debt premium 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- 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 FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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