Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value of Assets and Liabilities
Financial liabilities	$ 3,298,478
Unamortized discounts	(11,005)	$ (12,865)
Senior Notes, due 2016 at 6.3%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	$ 275,000	$ 275,000
Interest rate stated percentage	6.30%	6.30%
Senior Notes, due 2017 at 5.625%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	$ 300,000	$ 300,000
Interest rate stated percentage	5.625%	5.625%
Senior Notes, due 2018 at 6.7%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	$ 350,000	$ 350,000
Interest rate stated percentage	6.70%	6.70%
Senior Notes, due 2022 at 5.0%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	$ 500,000	$ 500,000
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
Debt Instrument, Carrying Amount	$ 350,000	$ 350,000
Interest rate stated percentage	4.65%	4.65%
Senior Notes, due 2025 at 4.5%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	$ 350,000	$ 350,000
Interest rate stated percentage	4.50%	4.50%
Convertible Senior Notes, due 2027 at 3.8%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	$ 8,478	$ 8,478
Interest rate stated percentage	3.80%	3.80%
Carrying Amount
Fair Value of Assets and Liabilities
Unamortized discounts	$ (11,005)	$ (12,865)
Debt Instrument, Carrying Amount	2,422,473	2,420,613
Carrying Amount \| Senior Notes, due 2016 at 6.3%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	275,000	275,000
Carrying Amount \| Senior Notes, due 2017 at 5.625%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	300,000	300,000
Carrying Amount \| Senior Notes, due 2018 at 6.7%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	350,000	350,000
Carrying Amount \| Senior Notes, due 2022 at 5.0%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	500,000	500,000
Carrying Amount \| Senior Notes, due 2023 at 4.5%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	300,000	300,000
Carrying Amount \| Senior Notes, due 2024 at 4.65%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	350,000	350,000
Carrying Amount \| Senior Notes, due 2025 at 4.5%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	350,000	350,000
Carrying Amount \| Convertible Senior Notes, due 2027 at 3.8%
Fair Value of Assets and Liabilities
Debt Instrument, Carrying Amount	8,478	8,478
Fair Value
Fair Value of Assets and Liabilities
Financial liabilities, Fair Value	2,462,034	2,555,093
Fair Value \| Senior Notes, due 2016 at 6.3%
Fair Value of Assets and Liabilities
Financial liabilities, Fair Value	275,813	287,680
Fair Value \| Senior Notes, due 2017 at 5.625%
Fair Value of Assets and Liabilities
Financial liabilities, Fair Value	311,181	321,675
Fair Value \| Senior Notes, due 2018 at 6.7%
Fair Value of Assets and Liabilities
Financial liabilities, Fair Value	370,438	386,755
Fair Value \| Senior Notes, due 2022 at 5.0%
Fair Value of Assets and Liabilities
Financial liabilities, Fair Value	515,760	529,160
Fair Value \| Senior Notes, due 2023 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities, Fair Value	295,709	306,516
Fair Value \| Senior Notes, due 2024 at 4.65%
Fair Value of Assets and Liabilities
Financial liabilities, Fair Value	346,010	360,757
Fair Value \| Senior Notes, due 2025 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities, Fair Value	338,426	353,701
Fair Value \| Convertible Senior Notes, due 2027 at 3.8%
Fair Value of Assets and Liabilities
Financial liabilities, Fair Value	$ 8,697	$ 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 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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 3: 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

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

+ References

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
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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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

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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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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