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Other Intangible, Net and Goodwill
9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets and Goodwill Other Intangibles, Net and Goodwill

All intangible assets determined to have finite lives are amortized over their estimated useful lives. The useful life of an intangible asset is the period over which the asset is expected to contribute directly or indirectly to future cash flows. There was a $4.7 million change in the gross amount of identifiable intangible assets during the three and nine months ended September 30, 2017 related to the acquisition of IDC. Amortization expense of $0.8 million, $1.8 million and $0.5 million, $1.4 million for the three and nine months ended September 30, 2017 and 2016, respectively, was included in depreciation and amortization in the consolidated statements of comprehensive income. Intangible assets subject to amortization consisted of the following at September 30, 2017:
 
Amortization period (years)
 
Gross Amount
 
Accumulated Amortization
 
Net intangible assets
 
 
 
(in thousands)
Customer relationships
20
 
$
10,800

 
$
1,510

 
$
9,290

Tradename
0.5-6
 
7,800

 
4,969

 
2,831

Covenants not to compete
1-10
 
4,200

 
1,291

 
2,909

 
 
 
$
22,800

 
$
7,770

 
$
15,030



Changes in carrying amount of goodwill were as follows:

 
(in thousands)
Balance at December 31, 2016
$
100,212

Acquisition
31,973

Balance at September 30, 2017
$
132,185