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Note 8 - Leases (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Lease, Cost [Table Text Block]
(dollars in thousands)
  
Three Months Ended
    
Nine Months Ended
  
   
September 30, 2019
    
September 30, 2019
  
                 
Finance lease cost:
                
Amortization of right-of-use assets
   $
1,406
     $
4,225
  
Interest on lease liabilities
    
210
      
644
  
Operating lease cost
    
6,167
      
17,824
  
                 
Total lease cost
   $
7,783
     $
22,693
  
                 
Other information
                
Cash paid for amounts included in the measurement of lease liabilities:
                
Operating cash flows from finance leases
    
1,146
      
3,589
  
Operating cash flows from operating leases
    
6,167
      
17,824
  
Financing cash flows from finance leases
    
210
      
644
  
Right-of-use assets obtained in exchange for new operating lease liabilities
    
20,096
      
26,421
  
Weighted-average remaining lease term—finance leases
    
 
      
3.0 years
  
Weighted-average remaining lease term—operating leases
    
 
      
3.5 years
  
Weighted-average discount rate—finance leases
    
 
      
3.0
 %
Weighted-average discount rate—operating leases
    
 
      
5.0
 %
Lessee, Lease Liability, Maturity [Table Text Block]
(in thousands)
  
Operating
    
Finance
  
2019 (1)   $
5,381
     $
8,151
  
2020
    
19,075
      
8,074
  
2021
    
15,281
      
9,960
  
2022
    
13,050
      
11,245
  
2023
    
4,835
      
362
  
Thereafter
    
2,431
      
1,119
  
Total minimum lease payments
   $
60,053
     $
38,911
  
Less: amount representing interest
    
(5,260
 )    
(2,650
 )
Present value of minimum lease payments
   $
54,793
     $
36,261
  
Less: current portion
    
(17,875
 )    
(7,164
 )
Lease obligations, long-term
   $
36,918
     $
29,097