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Other Intangible, Net and Goodwill
9 Months Ended
Sep. 30, 2016
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 nine months ended September 30, 2016. Amortization expense of $0.5 million, $1.4 million, $0.6 million, and $1.8 million for the three and nine months ended September 30, 2016 and 2015, 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, 2016:
 
Amortization period (years)
 
Gross Amount
 
Accumulated Amortization
 
Net intangible assets
 
 
 
(in thousands)
Customer relationships
20
 
$
7,600

 
$
1,092

 
$
6,508

Tradename
6
 
7,400

 
3,544

 
3,856

Covenants not to compete
10
 
3,100

 
894

 
2,206

Real estate options
2.2
 
942

 
942

 

 
 
 
$
19,042

 
$
6,472

 
$
12,570



Carrying amounts of goodwill were as follows:
 
(in thousands)
Balance at December 31, 2015
$
100,212

Acquisitions

Balance at September 30, 2016
$
100,212