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Note 6 - Fair Value Measurements - Carrying Amounts and Fair Values (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Assets, carrying amount $ 173,467 $ 138,040
Long-term debt, including current portion, carrying amount 544,030  
Notes [Member]    
Long-term debt, including current portion, carrying amount 450,000  
Long-term debt, including current portion, fair value 469,125  
Term Loan [Member]    
Long-term debt, including current portion, carrying amount 93,750  
Long-term debt, including current portion, fair value 93,750  
Money Market Funds [Member]    
Assets, carrying amount 72,334  
Assets, fair value 72,334  
Commercial Paper [Member]    
Assets, carrying amount 91,297  
Assets, fair value $ 91,512