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Indebtedness - Issuances and Principal Repayment (Details) - USD ($) $ in Thousands				3 Months Ended
	Apr. 24, 2017	Mar. 15, 2017	Jan. 13, 2017	Mar. 31, 2017	Mar. 31, 2016
Indebtedness
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses				$ 598,246	$ 737,612
Repurchase of convertible senior notes				$ 8,431	$ 0
Senior unsecured notes, due 2027 at 4.95%
Indebtedness
Interest rate, stated percentage				4.95%
Senior unsecured notes
Indebtedness
Issuance of senior notes			$ 600,000
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses			593,300
Senior unsecured notes | Senior unsecured notes, due 2023 at 4.5%
Indebtedness
Issuance of senior notes			$ 200,000
Interest rate, stated percentage			4.50%
Senior unsecured notes | Senior unsecured notes, due 2027 at 4.95%
Indebtedness
Issuance of senior notes			$ 400,000
Interest rate, stated percentage			4.95%
Senior unsecured notes | Senior unsecured notes, due 2027 at 3.8%
Indebtedness
Interest rate, stated percentage		3.80%
Repurchase of convertible senior notes		$ 8,431
Subsequent event | Senior unsecured notes | Senior unsecured notes, due 2027 at 3.8%
Indebtedness
Repurchase of convertible senior notes	$ 47

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: 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=64930739&loc=d3e28878-108400

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

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

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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 with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: 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=66902209&loc=d3e3255-108585

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- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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