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Summary Of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2014
Accounting Policies [Abstract]  
Schedule of common stock repurchased [Table Text Block]
The following table provides information about share repurchases that Avista Corp. made during the three months ended September 30, 2014 (in thousands, except per share amounts): 
 
Total Number of Shares Purchased
 
Average Price Paid per Share
 
Total Number of Shares Purchased as Part of Publicly Announced Program
 
Maximum Number of Shares that May Yet Be Purchased Under the Program
July 1 to July 31, 2014
292

 
$
32.30

 
292

 
3,708

August 1 to August 31, 2014
927

 
31.50

 
927

 
2,781

September 1 to September 30, 2014
705

 
31.67

 
705

 
2,076

Total
1,924

 
$
31.68

 
1,924

 
2,076
Appropriated Retained Earnings [Table Text Block]
The appropriated retained earnings amounts included in retained earnings were as follows as of September 30, 2014 and December 31, 2013 (dollars in thousands):
 
September 30,
 
December 31,
 
2014
 
2013
Appropriated retained earnings
$
14,270

 
$
9,714
Schedule of Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive loss, net of tax, consisted of the following as of September 30, 2014 and December 31, 2013 (dollars in thousands):
 
September 30,
 
December 31,
 
2014
 
2013
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $(2,099) and $(2,280), respectively
$
(3,898
)
 
$
(4,233
)
Unrealized loss on securities available for sale - net of taxes of $0 and $(936), respectively (1)
—

 
(1,586
)
Total accumulated other comprehensive loss
$
(3,898
)
 
$
(5,819
)
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 (dollars in thousands):
 
 
Amounts Reclassified from Accumulated Other Comprehensive Loss
 
 
 
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
Details about Accumulated Other Comprehensive Loss Components
 
2014
 
2013
 
2014
 
2013
 
Affected Line Item in Statement of Income
Realized gains on investment securities
 
$
—

 
$
2

 
$
3

 
$
20

 
(a)
Realized losses on investment securities
 
—

 
—

 
(735
)
 
—

 
(a)
 
 
—

 
2

 
(732
)
 
20

 
Total before tax
 
 
—

 
(1
)
 
272

 
(8
)
 
Tax benefit (expense) (a)
 
 
$
—

 
$
1

 
$
(460
)
 
$
12

 
Net of tax
Amortization of defined benefit pension items
 
 
 
 
 
 
 
 
 
Amortization of net loss
 
$
(1,951
)
 
$
(4,891
)
 
$
(5,855
)
 
$
(14,673
)
 
(b)
Adjustment due to effects of regulation
 
1,779

 
4,608

 
5,339

 
13,825

 
(b)
 
 
(172
)
 
(283
)
 
(516
)
 
(848
)
 
Total before tax
 
 
60

 
99

 
181

 
297

 
Tax benefit
 
 
$
(112
)
 
$
(184
)
 
$
(335
)
 
$
(551
)
 
Net of tax
(a)
These amounts were included as part of net income from discontinued operations for all periods presented (see Note 5 for additional details).
(b)
These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 7 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,
 
2014
 
2013
 
2014
 
2013
Utility taxes
$
11,716

 
$
10,901

 
$
43,923

 
$
41,045
Other Income - Net
Other income-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,
 
2014
 
2013
 
2014
 
2013
Interest income
$
154

 
$
124

 
$
678

 
$
620

Interest income on regulatory deferrals
59

 
27

 
154

 
48

Equity-related AFUDC
2,189

 
1,595

 
6,426

 
4,341

Net gain/(loss) on investments
(27
)
 
(1,299
)
 
118

 
(1,543
)
Other income
233

 
41

 
887

 
973

Total
$
2,608

 
$
488

 
$
8,263

 
$
4,439
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, 2014 and December 31, 2013 (dollars in thousands):
 
September 30,
 
December 31,
 
2014
 
2013
Materials and supplies
$
31,226

 
$
28,747

Fuel stock
5,170

 
3,170

Natural gas stored
33,545

 
13,029

Total
$
69,941

 
$
44,946
Investments And Funds Held For Clients
Investments and funds held for clients as of December 31, 2013 were as follows (dollars in thousands):
 
Amortized
Cost (1)
 
Unrealized
Gain (Loss)
 
Fair Value
Cash and cash equivalents
$
16,147

 
$
—

 
$
16,147

Money market funds
11,180

 
—

 
11,180

Securities available for sale:
 
 
 
 
 
U.S. government agency
63,633

 
(2,555
)
 
61,078

Municipal
3,497

 
21

 
3,518

Corporate fixed income – financial
3,000

 
—

 
3,000

Corporate fixed income – industrial
753

 
12

 
765

Certificates of deposit
1,000

 
—

 
1,000

Total securities available for sale
71,883

 
(2,522
)
 
69,361

Total investments and funds held for clients
$
99,210

 
$
(2,522
)
 
$
96,688

(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 December 31, 2013 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
December 31, 2013
5,382

 
12,745

 
48,310

 
2,924

 
69,361
Goodwill
The changes in the carrying amount of goodwill are as follows (dollars in thousands):
 
Ecova
 
AEL&P
 
Other
 
Accumulated
Impairment
Losses
 
Total
December 31, 2013
$
71,011

 
$
—

 
$
12,979

 
$
(7,733
)
 
$
76,257

Adjustments
112

 
—

 
—

 
—

 
112

Goodwill sold during the year
(71,123
)
 
—

 
—

 
—

 
(71,123
)
Goodwill acquired during the year
—

 
50,631

 
—

 
—

 
50,631

Balance as of September 30, 2014
$
—

 
$
50,631

 
$
12,979

 
$
(7,733
)
 
$
55,877
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,
 
2014
 
2013
 
2014
 
2013
Intangible asset amortization
$
—

 
$
2,765

 
$
5,898

 
$
8,442
Accumulated Amortization Of Other Intangibles
The gross carrying amount and accumulated amortization of intangible assets as of December 31, 2013 are as follows (dollars in thousands):
 
Estimated
 
December 31,
 
Useful Lives
 
2013
Client relationships
2 - 12 years
 
$
33,562

Software development costs
3 - 7 years
 
39,327

Other
1 - 10 years
 
3,321

Total intangible assets
 
 
76,210

Client relationships accumulated amortization
 
 
(12,336
)
Software development costs accumulated amortization
 
 
(21,861
)
Other accumulated amortization
 
 
(2,437
)
Total accumulated amortization
 
 
(36,634
)
Total intangible assets - net
 
 
$
39,576
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,
 
2014
 
2013
 
2014
 
2013
Proceeds from sales, maturities and calls
$
—

 
$
1,825

 
$
14,612

 
$
16,955

Gross realized gains
—

 
2

 
3

 
20

Gross realized losses (1)
—

 
—

 
(735
)
 
—