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Subsequent Events (Details) - USD ($)	May 01, 2018	Apr. 30, 2018	Jun. 30, 2017	Mar. 31, 2013
Convertible Debt | Convertible Senior Notes Due 2018
Subsequent Event [Line Items]
Amount of debt repurchased			$ 37,000,000
Debt Instrument interest rate				4.625%
Subsequent Event | 5 Arches, LLC
Subsequent Event [Line Items]
Minority interest, purchase agreement	20.00%
Purchase agreement, preliminary amount	$ 10,000,000
Purchase agreement, option to purchase remaining amount period	1 year
Purchase agreement, potential remaining purchase amount	$ 40,000,000
Subsequent Event | Convertible Debt | Convertible Senior Notes Due 2018
Subsequent Event [Line Items]
Amount of debt repurchased		$ 250,000,000
Debt Instrument interest rate		4.625%

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- Definition

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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

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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