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Goodwill and other intangible assets
3 Months Ended
Mar. 31, 2014
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, 2014
Balance
as of
January 1,
2014*
Goodwill
Acquired
During
the Year
Balance
as of
March 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


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, 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.



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 were as follows:
 
March 31,
2014
March 31,
2013
December 31,
2013
 
(In thousands)
Customer relationships
$
21,310

$
21,310

$
21,310

Accumulated amortization
(14,230
)
(12,211
)
(13,726
)
 
7,080

9,099

7,584

Noncompete agreements
5,580

7,236

6,186

Accumulated amortization
(4,335
)
(5,439
)
(4,840
)
 
1,245

1,797

1,346

Other
10,920

10,979

10,995

Accumulated amortization
(6,949
)
(5,557
)
(6,826
)
 
3,971

5,422

4,169

Total
$
12,296

$
16,318

$
13,099



Amortization expense for amortizable intangible assets for the three months ended March 31, 2014 and 2013, was $800,000 and $800,000, respectively. Estimated amortization expense for amortizable intangible assets is $3.2 million in 2014, $2.5 million in 2015, $2.2 million in 2016, $2.0 million in 2017, $1.0 million in 2018 and $2.2 million thereafter.