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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.

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No definition available.

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Description of the transfers of assets measured on a recurring basis out of Level 1 and into Level 2 of the fair value hierarchy.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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- Definition

The aggregate value of all restricted investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-12C.9(c))
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010

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Fair Value Measurements (Narrative) (Details) - USD ($)	3 Months Ended
Fair Value Measurements (Narrative) (Details) - USD ($)	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair value assets and liabilities measured on recurring basis [Line Items]
Transfers between Levels 1 and 2, description	The Company did not have material transfers between Levels 1 and 2 during the three months ended March 31, 2018 or 2017.	The Company did not have material transfers between Levels 1 and 2 during the three months ended March 31, 2018 or 2017.
Transfers between Levels 1 and 2, amount	$ 0	$ 0
Convertible Notes [Member]
Long-term Debt
Long-term debt, fair value	210,200,000		$ 222,200,000
2017 Senior Notes [Member] \| Senior Notes [Member]
Long-term Debt
Long-term debt, fair value	515,000,000		537,500,000
Significant Other Observable Inputs (Level 2) [Member]
Long-term Debt
Restricted investments, fair value	$ 52,500,000		$ 52,500,000