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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments Under Non-cancelable Operating Leases

Future minimum payments, by year and in the aggregate, under non-cancellable operating leases with initial or remaining lease terms of one year or more, are as follows:

 

(Thousands)

 

 

 

 

2017

 

$

15,483

 

2018

 

 

11,390

 

2019

 

 

7,450

 

2020

 

 

4,840

 

2021

 

 

2,030

 

Thereafter

 

 

5,579

 

Total

 

$

46,772