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Leases (Tables)
12 Months Ended
Dec. 31, 2018
Leases [Abstract]  
Future Minimum Rental Payments for Operating Leases [Table Text Block]
As of December 31, 2018, our minimum lease payment requirements for noncancelable operating and capital leases with terms of more than one year are as follows (in thousands):

 
 
Operating Leases
 
Capital Leases
 
 
(thousands)
2019
 
$
13,222

 
$
2,578

2020
 
12,734

 
2,617

2021
 
11,595

 
2,656

2022
 
10,208

 
2,694

2023
 
9,800

 
2,740

Thereafter
 
40,381

 
30,177

Total
 
$
97,940

 
43,462

Less - interest on capital lease obligations
 
 
 
(20,838
)
Total principal payable on capital lease obligations
 
 
 
22,624

Less - current obligations
 
 
 
(703
)
Long-term capital lease obligations
 
 
 
$
21,921

Future Minimum Rental Payments for Capital Leases [Table Text Block]
As of December 31, 2018, our minimum lease payment requirements for noncancelable operating and capital leases with terms of more than one year are as follows (in thousands):

 
 
Operating Leases
 
Capital Leases
 
 
(thousands)
2019
 
$
13,222

 
$
2,578

2020
 
12,734

 
2,617

2021
 
11,595

 
2,656

2022
 
10,208

 
2,694

2023
 
9,800

 
2,740

Thereafter
 
40,381

 
30,177

Total
 
$
97,940

 
43,462

Less - interest on capital lease obligations
 
 
 
(20,838
)
Total principal payable on capital lease obligations
 
 
 
22,624

Less - current obligations
 
 
 
(703
)
Long-term capital lease obligations
 
 
 
$
21,921