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Leases (Tables)
12 Months Ended
Dec. 31, 2015
Leases [Abstract]  
Operating Leases of Lessee Disclosure
Minimum payments due in future years under these agreements in effect at December 31, 2015 are as follows:
 
Operating
 
 
 
Leases
 
Royalties
 
(In thousands)
2016
$
20,857

 
$
8,947

2017
17,277

 
13,991

2018
6,412

 
13,097

2019
3,448

 
12,295

2020
2,151

 
11,996

Thereafter
9,807

 
103,771

 
$
59,952

 
$
164,097