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Financial Instruments Financial Instruments narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Feb. 15, 2017	Dec. 31, 2016
Convertible Debt, Fair Value Disclosures	$ 3,400,000
Debt securities gross unrealized gains	500
Debt instrument fair value senior notes 2023	772,200
Debt instrument fair value senior notes 2025	535,000
fair value of contingent interest payment	7,500		$ 14,300
contingent interest payment		$ 7,700	6,600
Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	$ 1,564,097		$ 1,626,764

X

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

+ Details

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X

- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Convertible Security
-URI http://asc.fasb.org/extlink&oid=6509036

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- Definition

The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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X

- Definition

contingent interest payment

+ References

No definition available.

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- Definition

Debt instrument fair value senior notes 2023

+ References

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- Definition

Debt instrument fair value senior notes 2025

+ References

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- Definition

fair value of contingent interest payment

+ References

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