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Note 5 - Fair Value of Financial Instruments Other Fair Value Disclosure (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes		$ 1,030,348	$ 1,027,074
Carrying (Reported) Amount, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost Method Investments	[1]	0	334
Senior Notes		1,030,348	1,027,074
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost Method Investments, Fair Value Disclosure	[1]	0	3,226
Senior Notes, Fair Value		$ 1,007,687	$ 1,093,934
[1] As a result of implementing the update to the standard for the accounting of financial instruments effective January 1, 2018, other invested assets, primarily consisting of investments in limited partnerships, are no longer carried at amortized cost, and instead are valued in our consolidated balance sheets using the net asset value as a practical expedient to estimate fair value.

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- Definition

The fair value amount of senior notes whether such amount is presented as a separate caption or as a parenthetical disclosure.

+ References

No definition available.

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- Definition

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

No definition available.

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- Definition

Fair value portion of investments accounted under the cost method.

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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

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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