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Summary Of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2013
Accounting Policies [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive loss, net of tax, consisted of the following as of September 30, 2013 and December 31, 2012 (dollars in thousands):
 
September 30,
 
December 31,
 
2013
 
2012
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $(3,401) and $(3,698), respectively
$
(6,316
)
 
$
(6,867
)
Unrealized gain (loss) on securities available for sale - net of taxes of $(904) and $97, respectively
(1,532
)
 
167

Total accumulated other comprehensive loss
$
(7,848
)
 
$
(6,700
)
Reclassifications Out of Accumulated Other Comprehensive Loss by Component
The following table details the reclassifications out of accumulated other comprehensive loss by component for the three and nine months ended September 30, 2013 (dollars in thousands):
 
 
Amounts Reclassified from Accumulated Other Comprehensive Loss
 
 
Details about Accumulated Other Comprehensive Loss Components
 
Three Months Ended
September 30, 2013
 
Nine Months Ended
September 30, 2013
 
Affected Line Item in Statement of Income
Realized gains on investment securities
 
$
2

 
$
20

 
Other income-net
 
 
2

 
20

 
Total before tax
 
 
(1
)
 
(8
)
 
Tax expense
 
 
$
1

 
$
12

 
Net of tax
Amortization of defined benefit pension items
 
 
 
 
 
 
Amortization of net loss
 
$
(4,891
)
 
$
(14,673
)
 
(a)
Adjustment due to effects of regulation
 
4,608

 
13,825

 
(a)
 
 
(283
)
 
(848
)
 
Total before tax
 
 
99

 
297

 
Tax benefit
 
 
$
(184
)
 
$
(551
)
 
Net of tax
(a)
These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 6 for additional details).
Utility Taxes
Utility related taxes collected from customers (primarily state excise taxes and city utility taxes) are recorded as operating revenue and expense and totaled the following amounts for the three and nine months ended September 30 (dollars in thousands):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2013
 
2012
 
2013
 
2012
Utility taxes
$
10,901

 
$
10,741

 
$
41,045

 
$
41,353
Other Income - Net
Other (Income)/Expense-net consisted of the following items for the three and nine months ended September 30 (dollars in thousands):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2013
 
2012
 
2013
 
2012
Interest income
$
(124
)
 
$
(166
)
 
$
(620
)
 
$
(804
)
Interest income on regulatory deferrals
(27
)
 
(19
)
 
(48
)
 
(43
)
Equity-related AFUDC
(1,595
)
 
(1,127
)
 
(4,341
)
 
(2,875
)
Net loss on investments
1,299

 
2,430

 
1,543

 
2,957

Other income
(537
)
 
(700
)
 
(2,099
)
 
(2,127
)
Total
$
(984
)
 
$
418

 
$
(5,565
)
 
$
(2,892
)
Materials And Supplies Fuel Stock And Natural Gas Stored
Inventories of materials and supplies, fuel stock and natural gas stored are recorded at average cost for our regulated operations and the lower of cost or market for our non-regulated operations and consisted of the following as of September 30, 2013 and December 31, 2012 (dollars in thousands):
 
September 30,
 
December 31,
 
2013
 
2012
Materials and supplies
$
29,334

 
$
26,058

Fuel stock
3,750

 
4,121

Natural gas stored
23,759

 
17,276

Total
$
56,843

 
$
47,455
Investments And Funds Held For Clients
Investments and funds held for clients as of September 30, 2013 are as follows (dollars in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gain (Loss)
 
Fair Value
Cash and cash equivalents
$
14,155

 
$
—

 
$
14,155

Money market funds
3,238

 
—

 
3,238

Securities available for sale:
 
 
 
 
 
U.S. government agency
68,631

 
(2,466
)
 
66,165

Municipal
3,529

 
13

 
3,542

Corporate fixed income – financial
3,000

 
4

 
3,004

Corporate fixed income – industrial
1,753

 
13

 
1,766

Certificates of deposit
1,000

 
—

 
1,000

Total securities available for sale
77,913

 
(2,436
)
 
75,477

Total investments and funds held for clients
$
95,306

 
$
(2,436
)
 
$
92,870







Investments and funds held for clients as of December 31, 2012 are as follows (dollars in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gain (Loss)
 
Fair Value
Cash and cash equivalents
$
13,867

 
$
—

 
$
13,867

Money market funds
15,084

 
—

 
15,084

Securities available for sale:
 
 
 
 
 
U.S. government agency
48,340

 
156

 
48,496

Municipal
820

 
28

 
848

Corporate fixed income – financial
5,010

 
16

 
5,026

Corporate fixed income – industrial
3,887

 
49

 
3,936

Certificates of deposit
1,000

 
15

 
1,015

Total securities available for sale
59,057

 
264

 
59,321

Total investments and funds held for clients
$
88,008

 
$
264

 
$
88,272

(1)
Amortized cost represents the original purchase price of the investments, plus or minus any amortized purchase premiums or accreted purchase discounts.
Contractual Maturities Of Securities Available For Sale
Contractual maturities of securities available for sale as of September 30, 2013 and December 31, 2012 are as follows (dollars in thousands): 
 
Due within 1 year
 
After 1 but within 5 years
 
After 5 but within 10 years
 
After 10 years
 
Total
September 30, 2013
$
5,655

 
$
18,479

 
$
48,437

 
$
2,906

 
$
75,477

December 31, 2012
3,047

 
11,786

 
41,485

 
3,003

 
59,321
Goodwill
The changes in the carrying amount of goodwill are as follows (dollars in thousands):
 
Ecova
 
Other
 
Accumulated
Impairment
Losses
 
Total
Balance as of December 31, 2012
$
70,713

 
$
12,979

 
$
(7,733
)
 
$
75,959

Adjustments
803

 
—

 
—

 
803

Balance as of September 30, 2013
$
71,516

 
$
12,979

 
$
(7,733
)
 
$
76,762
Other Intangible Amortization
Amortization expense related to Intangible Assets was as follows for the three and nine months ended September 30 (dollars in thousands):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2013
 
2012
 
2013
 
2012
Intangible asset amortization
$
2,765

 
$
2,436

 
$
8,442

 
$
7,091
Future Estimated Amortization Expense
The following table details the estimated amortization expense related to Intangible Assets for each of the five years ending December 31 (dollars in thousands):
 
Remaining
 
 
 
 
 
 
 
 
 
2013
 
2014
 
2015
 
2016
 
2017
Estimated amortization expense
$
2,292

 
$
10,460

 
$
8,484

 
$
7,359

 
$
6,516
Accumulated Amortization Of Other Intangibles
The gross carrying amount and accumulated amortization of Intangible Assets as of September 30, 2013 and December 31, 2012 are as follows (dollars in thousands):
 
Estimated
 
September 30,
 
December 31,
 
Useful Lives
 
2013
 
2012
Client backlog and relationships
2 - 12 years
 
$
33,559

 
$
32,059

Software development costs
3 - 7 years
 
38,148

 
33,990

Other
1 - 10 years
 
3,332

 
6,237

Total intangible assets
 
 
75,039

 
72,286

Client relationships accumulated amortization
 
 
(11,255
)
 
(7,793
)
Software development costs accumulated amortization
 
 
(20,383
)
 
(16,557
)
Other accumulated amortization
 
 
(2,248
)
 
(1,680
)
Total accumulated amortization
 
 
(33,886
)
 
(26,030
)
Total intangible assets - net
 
 
$
41,153

 
$
46,256
Disposition of Available-for-Sale Securities
The following is a summary of the disposition of available-for-sale securities for the three and nine months ended September 30 (dollars in thousands):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2013
 
2012
 
2013
 
2012
Proceeds from sales, maturities and calls
$
1,825

 
$
32,053

 
$
16,955

 
$
103,545

Gross realized gains
2

 
111

 
20

 
252

Gross realized losses
—

 
—

 
—

 
—