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Other Intangible, Net and Goodwill
3 Months Ended
Mar. 31, 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 months ended March 31, 2017. Amortization expense of $0.5 million, and $0.5 million for the three months ended March 31, 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 March 31, 2017:
 
Amortization period (years)
 
Gross Amount
 
Accumulated Amortization
 
Net intangible assets
 
 
 
(in thousands)
Customer relationships
20
 
$
7,600

 
$
1,282

 
$
6,318

Tradename
6
 
7,400

 
4,163

 
3,237

Covenants not to compete
10
 
3,100

 
1,046

 
2,054

 
 
 
$
18,100

 
$
6,491

 
$
11,609



There were no changes in the carrying amount of goodwill during the three months ended March 31, 2017.