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Intangibles, Net
 12 Months Ended
Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangibles, Net
Intangibles, Net
Intangibles, net, consisted of the following:
 
December 31, 2017
(in thousands)
Amortization
Method
 
Cost
 
Accumulated Amortization
 
Net
Trademarks
Straight-Line
 
$
13,540

 
$
(9,304
)
 
$
4,236

Customer relationships
Accelerated
 
99,133

 
(92,072
)
 
7,061

Patents
Straight-Line
 
42,780

 
(42,279
)
 
501

Total
 
 
$
155,453

 
$
(143,655
)
 
$
11,798

 
December 31, 2016
(in thousands)
Amortization
Method
 
Cost
 
Accumulated Amortization
 
Net
Trademarks
Straight-Line
 
$
13,540

 
$
(8,752
)
 
$
4,788

Customer relationships
Accelerated
 
98,926

 
(89,705
)
 
9,221

Patents
Straight-Line
 
42,780

 
(41,671
)
 
1,109

Total
 
 
$
155,246

 
$
(140,128
)
 
$
15,118

The Company recorded amortization expense for its intangible assets of $3.3 million, $5.1 million and $6.0 million for the years ended December 31, 2017, 2016 and 2015, respectively.
The below table summarizes the estimated aggregate amortization expense expected to be recognized on the above intangible assets:
(in thousands)
Amount
2018
$
2,649

2019
1,806

2020
1,571

2021
1,312

2022
1,175

2023 and thereafter
3,285

Total
$
11,798