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Other Intangible, Net and Goodwill
6 Months Ended
Jun. 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 no change in the gross amount of identifiable intangible assets during the three and six months ended June 30, 2017. Amortization expense of $0.5 million, $1.0 million and $0.5 million, $1.0 million for the three and six months ended June 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 June 30, 2017:
 
Amortization period (years)
 
Gross Amount
 
Accumulated Amortization
 
Net intangible assets
 
 
 
(in thousands)
Customer relationships
20
 
$
7,600

 
$
1,377

 
$
6,223

Tradename
6
 
7,400

 
4,471

 
2,929

Covenants not to compete
10
 
3,100

 
1,124

 
1,976

 
 
 
$
18,100

 
$
6,972

 
$
11,128



There were no changes in the carrying amount of goodwill during the three and six months ended June 30, 2017.