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Goodwill and other intangible assets
3 Months Ended
Mar. 31, 2013
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, 2013
Balance
as of
January 1,
2013*
Goodwill
Acquired
During
the Year
Balance
as of
March 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.



Three Months Ended
March 31, 2012
Balance
as of
January 1,
2012*
Goodwill
Acquired
During the
Year**
Balance
as of
March 31,
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

458

103,626

Total
$
634,931

$
458

$
635,389

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


Year Ended
December 31, 2012
Balance
as of
January 1,
2012*
Goodwill
Acquired
During the
Year**
Balance
as of
December 31,
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 contingent consideration that was not material related to an acquisition in a prior period.


Other amortizable intangible assets were as follows:
 
March 31,
2013
March 31,
2012
December 31,
2012
 
(In thousands)
Customer relationships
$
21,310

$
21,010

$
21,310

Accumulated amortization
(12,211
)
(10,197
)
(11,701
)
 
9,099

10,813

9,609

Noncompete agreements
7,236

7,086

7,236

Accumulated amortization
(5,439
)
(4,921
)
(5,326
)
 
1,797

2,165

1,910

Other
10,979

11,442

10,979

Accumulated amortization
(5,557
)
(4,429
)
(5,369
)
 
5,422

7,013

5,610

Total
$
16,318

$
19,991

$
17,129



Amortization expense for amortizable intangible assets for the three months ended March 31, 2013 and 2012, was $800,000 and $900,000, respectively. Estimated amortization expense for amortizable intangible assets is $3.7 million in 2013, $3.5 million in 2014, $2.6 million in 2015, $2.2 million in 2016, $1.9 million in 2017 and $3.2 million thereafter.