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Goodwill and other intangible assets (Tables)
 12 Months Ended
Dec. 31, 2014
Goodwill [Line Items]  
Changes in the carrying amount of goodwill
The changes in the carrying amount of goodwill for the year ended December 31, 2014, were as follows:
 
Balance at January 1, 2014

* 
Goodwill
Acquired
During the
Year/Other

 
Balance at 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.
 
 

The changes in the carrying amount of goodwill for the year ended December 31, 2013, were as follows:
 
Balance at January 1, 2013

* 
Goodwill Acquired
During
the Year

 
Balance at December 31, 2013

* 
 
(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.
 
 
Other amortizable intangible assets
Other amortizable intangible assets at December 31 were as follows:
 
2014

2013

 
(In thousands)
Customer relationships
$
21,310

$
21,310

Accumulated amortization
(15,556
)
(13,726
)
 
5,754

7,584

Noncompete agreements
5,080

6,186

Accumulated amortization
(4,098
)
(4,840
)
 
982

1,346

Other
10,921

10,995

Accumulated amortization
(7,817
)
(6,826
)
 
3,104

4,169

Total
$
9,840

$
13,099