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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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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Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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Period Type:	duration

- 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.

+ Details

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Balance Type:	credit
Period Type:	instant

- Details

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Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 11, 2016	Dec. 31, 2015
Senior Notes, due 2016 at 6.3%
Fair Value of Assets and Liabilities
Interest rate stated percentage	6.30%	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 2021 at 4.25 %
Fair Value of Assets and Liabilities
Interest rate stated percentage	4.25%		4.25%
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%
Senior Unsecured Notes, due 2026 at 5.25%
Fair Value of Assets and Liabilities
Interest rate stated percentage	5.25%		5.25%
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
Financial liabilities, Fair Value	$ 2,871,278		$ 2,411,917
Carrying Amount \| Senior Notes, due 2016 at 6.3%
Fair Value of Assets and Liabilities
Financial liabilities			274,869
Carrying Amount \| Senior Notes, due 2017 at 5.625%
Fair Value of Assets and Liabilities
Financial liabilities	299,757		299,576
Carrying Amount \| Senior Notes, due 2018 at 6.7%
Fair Value of Assets and Liabilities
Financial liabilities	349,104		348,821
Carrying Amount \| Senior Notes, due 2021 at 4.25 %
Fair Value of Assets and Liabilities
Financial liabilities	393,337
Carrying Amount \| Senior Notes, due 2022 at 5.0%
Fair Value of Assets and Liabilities
Financial liabilities	492,581		491,974
Carrying Amount \| Senior Notes, due 2023 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities	297,988		297,845
Carrying Amount \| Senior Notes, due 2024 at 4.65%
Fair Value of Assets and Liabilities
Financial liabilities	346,876		346,674
Carrying Amount \| Senior Notes, due 2025 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities	344,024		343,680
Carrying Amount \| Senior Unsecured Notes, due 2026 at 5.25%
Fair Value of Assets and Liabilities
Financial liabilities	339,133
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	3,025,554		2,462,034
Fair Value \| Senior Notes, due 2016 at 6.3%
Fair Value of Assets and Liabilities
Financial liabilities			275,813
Fair Value \| Senior Notes, due 2017 at 5.625%
Fair Value of Assets and Liabilities
Financial liabilities	307,914		311,181
Fair Value \| Senior Notes, due 2018 at 6.7%
Fair Value of Assets and Liabilities
Financial liabilities	365,932		370,438
Fair Value \| Senior Notes, due 2021 at 4.25 %
Fair Value of Assets and Liabilities
Financial liabilities	415,890
Fair Value \| Senior Notes, due 2022 at 5.0%
Fair Value of Assets and Liabilities
Financial liabilities	539,840		515,760
Fair Value \| Senior Notes, due 2023 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities	307,034		295,709
Fair Value \| Senior Notes, due 2024 at 4.65%
Fair Value of Assets and Liabilities
Financial liabilities	357,968		346,010
Fair Value \| Senior Notes, due 2025 at 4.5%
Fair Value of Assets and Liabilities
Financial liabilities	352,889		338,426
Fair Value \| Senior Unsecured Notes, due 2026 at 5.25%
Fair Value of Assets and Liabilities
Financial liabilities	369,436
Fair Value \| Convertible Senior Notes, due 2027 at 3.8%
Fair Value of Assets and Liabilities
Financial liabilities	$ 8,651		$ 8,697