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Note 12 - Condensed Consolidating Financial Information (Details Textual)	Jun. 30, 2019	Dec. 31, 2018
Equity Method Investment, Ownership Percentage	100.00%
Senior Notes [Member] | Senior Notes 6.875% Due 2023 [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.875%	6.875%
Senior Notes [Member] | Senior Notes 6.375% Due 2026 [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.375%	6.375%
Senior Notes [Member] | Senior Notes 6.000% Due 2026 [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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