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Lease Obligations (Tables)
6 Months Ended
Jun. 30, 2018
Leases [Abstract]  
Schedule of Future Minimum Lease Payments for Capital and Operating Leases [Table Text Block]
The future minimum lease payments required under capital leases and operating leases, together with the present value of capital leases, as of June 30, 2018 were as follows:
 
  
Capital
  
Operating
 
(In thousands)
 
Lease
Obligations
  
Lease
Obligations
 
       
Remainder of 2018 $592  $2,219 
2019  1,185   3,413 
2020  1,185   2,338 
2021  355   1,680 
2022     1,081 
Thereafter     514 
Total minimum lease payments $3,317  $11,245 
Interest  (147)    
Net present value of minimum lease payments  3,170     
Less: Current portion of capital lease obligations  1,102     
Long-term capital lease obligations $2,068