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Intangibles and Goodwill (Notes)
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure [Text Block]
. Intangible Assets

Intangible Assets, Net

The components of intangible assets as of March 31, 2018 and December 31, 2017 were as follows:
 
 
March 31, 2018
 
December 31, 2017
(in thousands)
 
Cost
 
Accumulated Amortization
 
Net
 
Cost
 
Accumulated Amortization
 
Net
Finite-lived intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
Acquired products rights(1)
 
$
216,690

 
$
(37,921
)
 
$
178,769

 
$
216,690

 
$
(32,503
)
 
$
184,187

Customer relationships(1) (2)
 
27,925

 
(4,423
)
 
23,502

 
26,080

 
(3,729
)
 
22,351

Acquired technology(2) (3)
 
11,011

 
(561
)
 
10,450

 
9,200

 
(409
)
 
8,791

Acquired trademarks(2)
 
570

 
(105
)
 
465

 
570

 
(76
)
 
494

 
 
$
256,196

 
$
(43,010
)
 
$
213,186

 
$
252,540

 
$
(36,717
)
 
$
215,823

________________
(1) The Company acquired certain intangible assets as part of the Noden Transaction. They are amortized on a straight-line basis over a weighted average period of 10.0 years.
(2) The Company acquired certain intangible assets as part of the LENSAR transaction, as described further in Note 19. They are amortized over a weighted average period of 10.0 years. The intangible assets for acquired technology and trademarks are being amortized over their estimated useful lives using the straight-line method of amortization. The intangible assets for customer relationships are being amortized using a double-declining method of amortization as such method better represents the economic benefits to be obtained.
(3)
The Company acquired certain intangible assets as part of the foreclosure on certain of Direct Flow Medical assets, as described further in Note 7. They are amortized over a weighted average period of 10.0 years. The intangible assets for acquired technology are being amortized over their estimated useful lives using the straight-line method of amortization.

Amortization expense for the three months ended March 31, 2018 and 2017 was $6.3 million and $6.0 million, respectively.

Based on the intangible assets recorded at March 31, 2018, and assuming no subsequent additions to or impairment of the underlying assets, the remaining estimated amortization expense is expected to be as follows (in thousands):
Fiscal Year
 
Amount
2018 (Remaining nine months)
 
$
19,058

2019
 
25,316

2020
 
25,281

2021
 
25,250

2022
 
25,145

2023
 
25,081

Thereafter
 
68,055

Total remaining estimated amortization expense
 
$
213,186