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Goodwill and other intangible assets (Tables)
 9 Months Ended
Sep. 30, 2012
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, 2012
Balance
as of
January 1,
2012*
Goodwill
Acquired
During
the Year**
Balance
as of
September 30,
2012*
 
(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
103,168

1,108

104,276

Total
$
634,931

$
1,108

$
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.
** Includes a purchase price adjustment that was not material related to an acquisition in a prior period.

Nine Months Ended
September 30, 2011
Balance
as of
January 1,
2011*
Goodwill
Acquired
During the
Year**
Balance
as of
September 30,
2011*
 
(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
102,870

298

103,168

Total
$
634,633

$
298

$
634,931

  * Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods.
** Includes a purchase price adjustment that was not material related to an acquisition in a prior period.

Year Ended
December 31, 2011
Balance
as of
January 1,
2011*
Goodwill
Acquired
During the
Year**
Balance
as of
December 31,
2011*
 
(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
102,870

298

103,168

Total
$
634,633

$
298

$
634,931

  * Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods.
** Includes a purchase price adjustment that was not material related to an acquisition in a prior period.
Other amortizable intangible assets
Other amortizable intangible assets were as follows:
 
September 30,
2012
September 30,
2011
December 31,
2011
 
(In thousands)
Customer relationships
$
21,310

$
21,702

$
21,702

Accumulated amortization
(11,192
)
(9,896
)
(10,392
)
 
10,118

11,806

11,310

Noncompete agreements
7,236

7,685

7,685

Accumulated amortization
(5,198
)
(5,222
)
(5,371
)
 
2,038

2,463

2,314

Other
10,979

12,901

11,442

Accumulated amortization
(5,120
)
(4,922
)
(4,223
)
 
5,859

7,979

7,219

Total
$
18,015

$
22,248

$
20,843