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Goodwill and Other Intangible Assets
6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets

The gross carrying amount and accumulated amortization of goodwill and other intangible assets as of June 30, 2018 and December 31, 2017 are as follows: 
 
 
June 30, 2018
 
December 31, 2017
Goodwill
 
$
4,150,340

 
$
4,150,339

Other intangible assets:
 
 

 
 

Gross carrying amount
 
$
3,856,262

 
$
3,816,402

Accumulated amortization
 
(3,745,591
)
 
(3,674,771
)
Net carrying amount
 
$
110,671

 
$
141,631



For the three months ended June 30, 2018 and 2017, amortization expense was $36,541 and $39,858, respectively. For the six months ended June 30, 2018 and 2017, amortization expense was $70,820 and $80,773, respectively.