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Goodwill and other intangible assets (Tables)
 9 Months Ended
Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying amount of goodwill
The changes in the carrying amount of goodwill were as follows:
Nine Months Ended
September 30, 2014
Balance
as of
January 1,
2014*
Goodwill
Acquired
During
the Year
Balance
as of
September 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.


Nine Months Ended
September 30, 2013
Balance
as of
January 1,
2013*
Goodwill
Acquired
During the
Year
Balance
as of
September 30, 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.


Year Ended
December 31, 2013
Balance
as of
January 1,
2013*
Goodwill
Acquired
During the
Year
Balance
as of
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 were as follows:
 
September 30,
2014
September 30,
2013
December 31,
2013
 
(In thousands)
Customer relationships
$
21,310

$
21,310

$
21,310

Accumulated amortization
(15,116
)
(13,221
)
(13,726
)
 
6,194

8,089

7,584

Noncompete agreements
5,080

6,186

6,186

Accumulated amortization
(4,021
)
(4,706
)
(4,840
)
 
1,059

1,480

1,346

Other
10,921

10,995

10,995

Accumulated amortization
(7,578
)
(6,472
)
(6,826
)
 
3,343

4,523

4,169

Total
$
10,596

$
14,092

$
13,099