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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
Future minimum annual rental commitments under non-cancelable leases at December 31, 2017 are as follows: 
 
(In thousands)
2018
$
10,378

2019
6,083

2020
5,435

2021
4,447

2022
3,975

Thereafter
16,553

 
$
46,871

Schedule of Minimum Volume Commitments
The estimable future commitments under these volume commitment agreements as of December 31, 2017 are as follows:
 
(In thousands)
2018
$
55,092

2019
63,675

2020
65,099

2021
64,282

2022
54,261

Thereafter
140,200

 
$
442,609