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Goodwill and other intangible assets
3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and other intangible assets
Goodwill and other intangible assets
The changes in the carrying amount of goodwill were as follows:
Three Months Ended March 31, 2016
Balance as of
January 1, 2016

*
Goodwill Acquired
During the Year

Balance as of
March 31, 2016

*
 
(In thousands)
Natural gas distribution
$
345,736

 
$

$
345,736

 
Pipeline and midstream
9,737

 

9,737

 
Construction materials and contracting
176,290

 

176,290

 
Construction services
103,441

 
6,323

109,764

 
Total
$
635,204

 
$
6,323

$
641,527

 
  * Balance is presented net of accumulated impairment of $12.3 million at the pipeline and midstream segment, which occurred in prior periods.
 

Three Months Ended March 31, 2015
Balance as of
January 1, 2015

*
Goodwill Acquired
During the Year

Balance as of
March 31, 2015

*
 
(In thousands)
Natural gas distribution
$
345,736

 
$

$
345,736

 
Pipeline and midstream
9,737

 

9,737

 
Construction materials and contracting
176,290

 

176,290

 
Construction services
103,441

 

103,441

 
Total
$
635,204

 
$

$
635,204

 
  * Balance is presented net of accumulated impairment of $12.3 million at the pipeline and midstream segment, which occurred in prior periods.


Year Ended December 31, 2015
Balance as of
January 1, 2015

*
Goodwill Acquired
During the Year

Balance as of
December 31, 2015

*
 
(In thousands)
Natural gas distribution
$
345,736

 
$

$
345,736

 
Pipeline and midstream
9,737

 

9,737

 
Construction materials and contracting
176,290

 

176,290

 
Construction services
103,441

 

103,441

 
Total
$
635,204

 
$

$
635,204

 
  * Balance is presented net of accumulated impairment of $12.3 million at the pipeline and midstream segment, which occurred in prior periods.
 

Other amortizable intangible assets were as follows:
 
March 31, 2016

March 31, 2015

December 31, 2015

 
(In thousands)
Customer relationships
$
17,145

$
20,975

$
20,975

Accumulated amortization
(12,680
)
(15,649
)
(16,845
)
 
4,465

5,326

4,130

Noncompete agreements
2,430

4,409

4,409

Accumulated amortization
(1,548
)
(3,504
)
(3,655
)
 
882

905

754

Other
7,764

8,300

8,304

Accumulated amortization
(5,308
)
(5,365
)
(5,846
)
 
2,456

2,935

2,458

Total
$
7,803

$
9,166

$
7,342


Amortization expense for amortizable intangible assets for the three months ended March 31, 2016 and 2015, was $600,000 and $700,000, respectively. Estimated amortization expense for amortizable intangible assets is $2.5 million in 2016, $2.2 million in 2017, $1.2 million in 2018, $1.0 million in 2019, $500,000 in 2020 and $1.0 million thereafter.