v3.3.1.900
COMMITMENTS AND CONTINGENCIES (Tables)
12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Payments for Operating Leases and Purchase Obligations [Table Text Block]
Future minimum rental payments applicable to all noncancellable operating leases and purchase obligations as of December 31, 2015 are as follows:
 
Payments Due by Period
 
2016
 
2017
 
2018
 
2019
 
2020
 
There-
after
 
Total
 
(Thousands of Dollars)
Operating leases
$
31,969

 
$
27,919

 
$
25,175

 
$
18,522

 
$
6,991

 
$
65,258

 
$
175,834

Purchase obligations
6,920

 
3,673

 
2,286

 
1,441

 
9

 

 
14,329