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Fair Value Measurements (Narrative) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
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

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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 + Details
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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 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 + Details
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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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