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Intangible Assets, net (Tables)
12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets
Intangible assets, net consisted of the following (in thousands):

 
December 31, 2018
 
December 31, 2017
 
Gross
 Carrying
 Amount
 
Accumulated
Amortization
 
Gross
 Carrying
 Amount
 
Accumulated
Amortization
Customer related (10-25 year life)
$
107,008

 
$
(69,678
)
 
$
107,008

 
$
(64,887
)
Contract based (5-7 year life)
64,556

 
(49,516
)
 
68,395

 
(41,644
)
Intangible assets
$
171,564

 
$
(119,194
)
 
$
175,403

 
$
(106,531
)
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
Estimated future intangible amortization expense is as follows (in thousands):

2019
$
13,047

2020
9,562

2021
4,687

2022
3,496

2023
3,251

Thereafter
18,327

Total
$
52,370