Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 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	$ (11,470)	$ (12,865)
Financial liabilities, Fair Value	2,422,008	2,420,613
Carrying Amount \| Senior Notes, due 2016 at 6.3%
Fair Value of Assets and Liabilities
Financial liabilities	275,000	275,000
Carrying Amount \| Senior Notes, due 2017 at 5.625%
Fair Value of Assets and Liabilities
Financial liabilities	300,000	300,000
Carrying Amount \| Senior Notes, due 2018 at 6.7%
Fair Value of Assets and Liabilities
Financial liabilities	350,000	350,000
Carrying Amount \| Senior Notes, due 2022 at 5.0%
Fair Value of Assets and Liabilities
Financial liabilities	500,000	500,000
Carrying Amount \| Senior Notes, due 2023 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities	300,000	300,000
Carrying Amount \| Senior Notes, due 2024 at 4.65%
Fair Value of Assets and Liabilities
Financial liabilities	350,000	350,000
Carrying Amount \| Senior Notes, due 2025 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities	350,000	350,000
Carrying Amount \| Convertible Senior Notes, due 2027 at 3.8%
Fair Value of Assets and Liabilities
Financial liabilities	8,478	8,478
Fair Value
Fair Value of Assets and Liabilities
Financial liabilities, Fair Value	2,497,271	2,555,093
Fair Value \| Senior Notes, due 2016 at 6.3%
Fair Value of Assets and Liabilities
Financial liabilities	277,452	287,680
Fair Value \| Senior Notes, due 2017 at 5.625%
Fair Value of Assets and Liabilities
Financial liabilities	315,342	321,675
Fair Value \| Senior Notes, due 2018 at 6.7%
Fair Value of Assets and Liabilities
Financial liabilities	377,557	386,755
Fair Value \| Senior Notes, due 2022 at 5.0%
Fair Value of Assets and Liabilities
Financial liabilities	522,080	529,160
Fair Value \| Senior Notes, due 2023 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities	301,239	306,516
Fair Value \| Senior Notes, due 2024 at 4.65%
Fair Value of Assets and Liabilities
Financial liabilities	349,269	360,757
Fair Value \| Senior Notes, due 2025 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities	345,667	353,701
Fair Value \| Convertible Senior Notes, due 2027 at 3.8%
Fair Value of Assets and Liabilities
Financial liabilities	$ 8,665	$ 8,849

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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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))

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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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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.

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