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Note 10 - Leases - Lease Cost (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities $ 3,990
Cash paid for amounts included in the measurement of lease liabilities 2,408
Right-of-use assets obtained in exchange for lease obligations $ 53,274
Weighted-average remaining lease term (months) (Month) 5 years 270 days
Weighted-average discount rate 4.50%
Selling, General and Administrative Expenses [Member]  
Operating lease cost $ 3,278
Short-term lease cost 334
Depreciation and Amortization [Member]  
Finance lease cost - amortization of right-of-use assets 3,322
Interest Expense [Member]  
Finance lease cost – interest on lease liabilities $ 712