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Note 4 - Long-Term Debt (Details) - Long-Term Debt (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Debt Instrument [Line Items]
Long-term debt	$ 544,950	$ 500,000
Debt Premium	797	864
Total	545,747	500,864
Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	500,000	500,000
Multicurrency Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	5,000	0	5,000
Norwegian Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ 39,950

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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