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Leasing Arrangements (Tables)
12 Months Ended
Dec. 31, 2015
Leases [Abstract]  
Future estimated minimum payments under capital leases and non-cancelable operating leases
The future estimated minimum payments under capital leases and non-cancelable operating leases with initial lease terms in excess of one year at December 31, 2015, are as follows:
 
 
Capital
 
Operating
(Thousands)
 
Leases
 
Leases
2016
 
$
1,064

 
$
6,834

2017
 
1,064

 
5,689

2018
 
1,064

 
4,816

2019
 
1,064

 
3,666

2020
 
1,064

 
3,318

2021 and thereafter
 
2,572

 
6,431

Total minimum lease payments
 
7,892

 
$
30,754

Amounts representing interest
 
1,379

 
 
Present value of net minimum lease payments
 
$
6,513