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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Rental Payments Under Lease Agreements
Future minimum rental payments under these agreements are as follows (in thousands):
Year Ended December 31,
 
Amount
2018
 
$
5,762

2019
 
4,087

2020
 
2,962

2021
 
2,371

2022
 
1,219

Thereafter
 
865

 
 
$
17,266

Future Minimum Rental Receipts Under Non - Cancelable Lease Agreements
Rental income and related expenses are included in “Other income (expense)” on the Consolidated Statements of Operations. Future minimum rental receipts under non-cancelable lease agreements are as follows (in thousands):
Year Ended December 31,
 
Amount
2018
 
$
835

2019
 
848

2020
 
862

2021
 
492

2022
 
305

Thereafter
 

 
 
$
3,342