The percentage of the principal amount of the bonds which was paid by the investors.

No definition available.

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- Definition

Net increase or decrease in the carrying amount of the debt instrument for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- 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.

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- Definition

The cash inflow from a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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Notes Payable - Note Issuances (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Mar. 31, 2017	Sep. 30, 2014	Mar. 31, 2017
Debt
Proceeds from issuance of debt			$ 711,812
Notes Payable \| 4.650% notes, issued in March 2017 and due in March 2047
Debt
Issuance of Debt	$ 300,000
Public offering price	99.97%		99.97%
Effective yield (as a percent)	4.65%		4.65%
Notes Payable \| 4.125% notes, issued in March 2017 and due in October 2026
Debt
Issuance of Debt	$ 400,000
Public offering price	102.98%		102.98%
Effective yield (as a percent)	3.75%		3.75%
Notes Payable \| 4.125% notes, issued in September 2014 and due in October 2026
Debt
Issuance of Debt		$ 250,000
Notes Payable \| Notes issued in March 2017
Debt
Proceeds from issuance of debt	$ 705,200