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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.

+ Details

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- Definition

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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- Definition

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

+ References

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- Definition

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.

+ Details

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Fair Value Measurements (Narrative) (Details) - USD ($)	6 Months Ended
Fair Value Measurements (Narrative) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 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 six months ended June 30, 2018 or 2017.
Transfers between Levels 1 and 2, amount	$ 0		$ 0
Convertible Notes [Member]
Long-term Debt
Long-term debt, fair value	202,200,000	$ 222,200,000
2017 Senior Notes [Member] \| Senior Notes [Member]
Long-term Debt
Long-term debt, fair value	$ 500,700,000	$ 537,500,000