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Goodwill and other intangible assets
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and other intangible assets
Goodwill and other intangible assets

The following table displays goodwill, indefinite-lived intangible assets, and amortizable intangible assets as of December 31, 2017 and December 31, 2016 (in thousands).
 
 
Gross
 
Accumulated
Amortization
 
Net
Dec. 31, 2017
 
 
 
 
 
 
Goodwill
 
$
2,579,417

 
$

 
$
2,579,417

Indefinite-lived intangibles:
 
 
 
 
 
 
Television station FCC licenses
 
1,191,950

 

 
1,191,950

Amortizable intangible assets:
 
 
 
 
 
 
Retransmission agreements
 
110,191

 
(62,355
)
 
47,836

Network affiliation agreements
 
43,485

 
(19,371
)
 
24,114

Other
 
15,763

 
(6,394
)
 
9,369

Total
 
$
3,940,806

 
$
(88,120
)
 
$
3,852,686

Dec. 31, 2016 (recast)
 
 
 
 
 
 
Goodwill
 
$
2,579,417

 
$

 
$
2,579,417

Indefinite-lived intangibles:
 
 
 
 
 
 
Television station FCC licenses
 
1,191,950

 

 
1,191,950

Amortizable intangible assets:
 
 
 
 
 
 
Retransmission agreements
 
110,191

 
(47,280
)
 
62,911

Network affiliation agreements
 
43,485

 
(14,445
)
 
29,040

Other
 
15,763

 
(4,825
)
 
10,938

Total
 
$
3,940,806

 
$
(66,550
)
 
$
3,874,256



Our retransmission agreements and network affiliation agreements are amortized on a straight-line basis over their estimated useful lives. Other intangibles primarily include customer relationships which are amortized on a straight-line basis over their useful lives.

During the second quarter of 2017, we recorded a $332.9 million goodwill impairment charge within discontinued operations related to our former CareerBuilder reporting unit. See Note 13 for further discussion. In 2016, we performed an interim goodwill impairment test for a small reporting unit in our former Digital segment. As a result of this test, we recorded a non-cash goodwill impairment charge of $15.2 million, representing the full amount of goodwill associated with this reporting unit. In 2015, we recorded an $8.0 million impairment charge for a reporting unit that has since been disposed. Other than these impairment charges, there have been no other changes to our goodwill balance in 2017, 2016 or 2015.

The following table shows the projected annual amortization expense, as of December 31, 2017, related to our existing amortizable intangible assets (in thousands):
2018
 
$
21,412

2019
 
$
20,029

2020
 
$
16,332

2021
 
$
10,457

2022
 
$
7,543

Thereafter
 
$
5,546

Total
 
$
81,319