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Leases (Tables)
12 Months Ended
Dec. 31, 2017
Leases, Operating [Abstract]  
Future Minimum Annual Lease Payments
Future minimum annual lease payments for assets under operating leases as of December 31, 2017 are as follows:
 
(In thousands)
 
Total
2018
 
$
12,609

2019
 
10,262

2020
 
7,907

2021
 
5,610

2022
 
4,016

Thereafter
 
25,362

 
 
$
65,766