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Note 9 - Fair Value Measurements - Carrying Amounts and Fair Values (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Reported Value Measurement [Member] | Senior Credit Facilities [Member]
Long-term debt, including current portion	$ 741,563
Estimate of Fair Value Measurement [Member] | Senior Credit Facilities [Member]
Long-term debt, including current portion	741,563
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Notes [Member]
Long-term debt, including current portion	450,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Notes [Member]
Long-term debt, including current portion	459,000
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]
Cash and cash equivalents	21,508
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	21,508
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]
Cash and cash equivalents	144,699
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	$ 144,612

X

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- 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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Period Type:	instant

X

- Details

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- Details

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- Details

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- Details

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- Details

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