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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Annual Commitments Under Operating Leases
Future minimum annual commitments under such operating leases at June 30, 2018 are as follows:
 
2019
$
17,304

2020
12,467

2021
9,973

2022
7,276

2023
5,072

Thereafter
37,007

Total
$
89,099