The price per share of the conversion feature embedded in the debt instrument.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Conversion Rate
-URI http://asc.fasb.org/extlink&oid=6509012

Reference 3: 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)(5))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
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- 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=34725769&loc=d3e28878-108400

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=6451184&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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- 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

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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Debt - Encore Convertible Notes (Details)	Mar. 05, 2014 $ / shares	Jun. 24, 2013 $ / shares	Nov. 27, 2012 $ / shares	Mar. 31, 2016	Mar. 31, 2014 USD ($)	Jul. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
2017 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate				3.00%
Initial conversion price (in dollars per share)			$ 31.56
Closing stock price at date of issuance (in dollars per share)			$ 25.66
Conversion rate (shares per $1,000 principal amount)			31.6832
2020 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate				3.00%
Initial conversion price (in dollars per share)		$ 45.72
Closing stock price at date of issuance (in dollars per share)		$ 33.35
Conversion rate (shares per $1,000 principal amount)		21.8718
2021 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate				2.875%
Initial conversion price (in dollars per share)	$ 59.39
Closing stock price at date of issuance (in dollars per share)	$ 47.51
Conversion rate (shares per $1,000 principal amount)	16.8386
Convertible Notes [Member] \| 2017 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount \| $							$ 115,000,000
Debt instrument, stated interest rate							3.00%
Convertible Notes [Member] \| 2020 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount \| $						$ 172,500,000.0
Debt instrument, stated interest rate						3.00%
Convertible Notes [Member] \| 2021 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount \| $					$ 161,000,000
Debt instrument, stated interest rate					2.875%