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Goodwill and other intangible assets
6 Months Ended
Jun. 30, 2015
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:
Six Months Ended
June 30, 2015
Balance
as of
January 1,
2015*
Goodwill
Acquired
During
the Year
Balance
as of
June 30, 2015*
 
(In thousands)
Natural gas distribution
$
345,736

$

$
345,736

Pipeline and energy services
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 energy services segment, which occurred in prior periods.
 


Six Months Ended
June 30, 2014
Balance
as of
January 1,
2014*
Goodwill
Acquired
During the
Year
Balance
as of
June 30, 2014*
 
(In thousands)
Natural gas distribution
$
345,736

$

$
345,736

Pipeline and energy services
9,737


9,737

Construction materials and contracting
176,290


176,290

Construction services
104,276


104,276

Total
$
636,039

$

$
636,039

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



Year Ended
December 31, 2014
Balance
as of
January 1,
2014*
Goodwill
Acquired
During the
Year/Other
Balance
as of
December 31,
2014*
 
(In thousands)
Natural gas distribution
$
345,736

$

$
345,736

Pipeline and energy services
9,737


9,737

Construction materials and contracting
176,290


176,290

Construction services
104,276

(835
)
103,441

Total
$
636,039

$
(835
)
$
635,204

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

Other amortizable intangible assets were as follows:
 
June 30,
2015
June 30,
2014
December 31, 2014
 
(In thousands)
Customer relationships
$
20,975

$
21,310

$
21,310

Accumulated amortization
(16,065
)
(14,734
)
(15,556
)
 
4,910

6,576

5,754

Noncompete agreements
4,409

5,080

5,080

Accumulated amortization
(3,581
)
(3,936
)
(4,098
)
 
828

1,144

982

Other
8,300

10,921

10,921

Accumulated amortization
(5,532
)
(7,375
)
(7,817
)
 
2,768

3,546

3,104

Total
$
8,506

$
11,266

$
9,840



Amortization expense for amortizable intangible assets for the three and six months ended June 30, 2015, was $700,000 and $1.4 million, respectively. Amortization expense for amortizable intangible assets for the three and six months ended June 30, 2014, was $1.0 million and $1.8 million, respectively. Estimated amortization expense for amortizable intangible assets is $2.5 million in 2015, $2.2 million in 2016, $1.9 million in 2017, $1.0 million in 2018, $900,000 in 2019 and $1.4 million thereafter.