Fair Value of Assets and Liabilities (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Senior Notes, due 2016 at 6.3%
Fair Value of Assets and Liabilities
Interest rate stated percentage	6.30%	6.30%
Senior Notes, due 2017 at 5.625%
Fair Value of Assets and Liabilities
Interest rate stated percentage	5.625%	5.625%
Senior Notes, due 2018 at 6.7%
Fair Value of Assets and Liabilities
Interest rate stated percentage	6.70%	6.70%
Senior Notes, due 2022 at 5.0%
Fair Value of Assets and Liabilities
Interest rate stated percentage	5.00%	5.00%
Senior Notes, due 2023 at 4.5%
Fair Value of Assets and Liabilities
Interest rate stated percentage	4.50%	4.50%
Senior Notes, due 2024 at 4.65%
Fair Value of Assets and Liabilities
Interest rate stated percentage	4.65%	4.65%
Senior Notes, due 2025 at 4.5%
Fair Value of Assets and Liabilities
Interest rate stated percentage	4.50%	4.50%
Convertible Senior Notes, due 2027 at 3.8%
Fair Value of Assets and Liabilities
Interest rate stated percentage	3.80%	3.80%
Carrying Amount
Fair Value of Assets and Liabilities
Unamortized discounts	(12,400)	(12,865)
Financial liabilities, Fair Value	2,421,078	2,420,613
Carrying Amount \| Senior Notes, due 2016 at 6.3%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	275,000	275,000
Carrying Amount \| Senior Notes, due 2017 at 5.625%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	300,000	300,000
Carrying Amount \| Senior Notes, due 2018 at 6.7%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	350,000	350,000
Carrying Amount \| Senior Notes, due 2022 at 5.0%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	500,000	500,000
Carrying Amount \| Senior Notes, due 2023 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	300,000	300,000
Carrying Amount \| Senior Notes, due 2024 at 4.65%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	350,000	350,000
Carrying Amount \| Senior Notes, due 2025 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	350,000	350,000
Carrying Amount \| Convertible Senior Notes, due 2027 at 3.8%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	8,478	8,478
Fair Value
Fair Value of Assets and Liabilities
Financial liabilities, Fair Value	2,569,335	2,555,093
Fair Value \| Senior Notes, due 2016 at 6.3%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	285,148	287,680
Fair Value \| Senior Notes, due 2017 at 5.625%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	321,198	321,675
Fair Value \| Senior Notes, due 2018 at 6.7%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	385,901	386,755
Fair Value \| Senior Notes, due 2022 at 5.0%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	534,155	529,160
Fair Value \| Senior Notes, due 2023 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	310,227	306,516
Fair Value \| Senior Notes, due 2024 at 4.65%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	364,457	360,757
Fair Value \| Senior Notes, due 2025 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	359,489	353,701
Fair Value \| Convertible Senior Notes, due 2027 at 3.8%
Fair Value of Assets and Liabilities
Financial liabilities, Carrying Amount	8,761	8,849

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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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 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

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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

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

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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