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Leases (Tables)
12 Months Ended
Dec. 31, 2016
Leases [Abstract]  
Operating Leases of Lessee Disclosure
Minimum payments due in future years under these agreements in effect at December 31, 2016 are as follows:
 
Operating
 
 
 
Leases
 
Royalties
 
(In thousands)
2017
$
14,653

 
$
3,994

2018
14,485

 
6,021

2019
5,321

 
6,105

2020
2,260

 
7,147

2021
1,985

 
7,809

Thereafter
10,317

 
46,499

 
$
49,021

 
$
77,575