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Derivatives And Risk Management (Tables)
 9 Months Ended
Sep. 30, 2015
Derivative Instruments and Hedges, Assets [Abstract]  
Energy Commodity Derivatives
The following table presents the underlying energy commodity derivative volumes as of September 30, 2015 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):
 
Purchases
 
Sales
 
Electric Derivatives
 
Gas Derivatives
 
Electric Derivatives
 
Gas Derivatives
Year
Physical (1)
MWH
 
Financial (1)
MWH
 
Physical (1)
mmBTUs
 
Financial (1)
mmBTUs
 
Physical (1)
MWH
 
Financial (1)
MWH
 
Physical (1)
mmBTUs
 
Financial (1)
mmBTUs
2015
171

 
805

 
8,962

 
50,538

 
39

 
1,142

 
1,683

 
32,768

2016
394

 
1,642

 
10,600

 
118,228

 
256

 
2,365

 
1,370

 
91,398

2017
397

 
—

 
675

 
35,823

 
286

 
483

 
1,360

 
19,008

2018
397

 
—

 
—

 
10,288

 
286

 
—

 
1,360

 
2,738

2019
235

 
—

 
—

 
4,500

 
158

 
—

 
1,345

 
—

Thereafter
—

 
—

 
—

 
—

 
—

 
—

 
2,470

 
—

 
(1)
Foreign Currency Exchange Contracts
The following table summarizes the foreign currency hedges that the Company has outstanding as of September 30, 2015 and December 31, 2014 (dollars in thousands):
 
September 30,
 
December 31,
 
2015
 
2014
Number of contracts
23

 
18

Notional amount (in United States currency)
$
10,140

 
$
5,474

Notional amount (in Canadian currency)
13,438

 
6,198
Interest Rate Swap Agreements
The following table summarizes the interest rate swaps that the Company has entered into as of September 30, 2015 and December 31, 2014 (dollars in thousands):
Balance Sheet Date
 
Number of Contracts
 
Notional Amount
 
Mandatory Cash Settlement Date
September 30, 2015
 
6
 
115,000

 
2016
 
 
3
 
45,000

 
2017
 
 
11
 
245,000

 
2018
 
 
1
 
20,000

 
2019
December 31, 2014
 
5
 
75,000

 
2015
 
 
5
 
95,000

 
2016
 
 
3
 
45,000

 
2017
 
 
9
 
205,000

 
2018
Derivative Instruments Summary
The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of September 30, 2015 (in thousands):
 
 
 
 
Fair Value
Derivative
 
Balance Sheet Location
 
Gross
Asset
 
Gross
Liability
 
Collateral
Netting
 
Net Asset
(Liability)
in Balance
Sheet
Foreign currency contracts
 
Other current liabilities
 
$
8

 
$
(73
)
 
$
—

 
$
(65
)
Interest rate contracts
 
Other current liabilities
 
—

 
(7,344
)
 
—

 
(7,344
)
Interest rate contracts
 
Other non-current liabilities and deferred credits
 
1,002

 
(81,631
)
 
36,270

 
(44,359
)
Commodity contracts
 
Current utility energy commodity derivative assets
 
900

 
(1
)
 
—

 
899

Commodity contracts
 
Current utility energy commodity derivative liabilities
 
60,218

 
(77,958
)
 
2,648

 
(15,092
)
Commodity contracts
 
Other non-current liabilities and deferred credits
 
15,007

 
(49,025
)
 
9,944

 
(24,074
)
Total derivative instruments recorded on the balance sheet
 
$
77,135

 
$
(216,032
)
 
$
48,862

 
$
(90,035
)
The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of December 31, 2014 (in thousands):
 
 
 
 
Fair Value
Derivative
 
Balance Sheet Location
 
Gross
Asset
 
Gross
Liability
 
Collateral
Netting
 
Net Asset
(Liability)
in Balance Sheet
Foreign currency contracts
 
Other current liabilities
 
$
1

 
$
(21
)
 
$
—

 
$
(20
)
Interest rate contracts
 
Other current assets
 
966

 
(506
)
 
—

 
460

Interest rate contracts
 
Other current liabilities
 
—

 
(7,325
)
 
—

 
(7,325
)
Interest rate contracts
 
Other non-current liabilities and deferred credits
 
—

 
(69,737
)
 
28,880

 
(40,857
)
Commodity contracts
 
Current utility energy commodity derivative assets
 
2,063

 
(538
)
 
—

 
1,525

Commodity contracts
 
Current utility energy commodity derivative liabilities
 
66,421

 
(97,586
)
 
13,120

 
(18,045
)
Commodity contracts
 
Other non-current liabilities and deferred credits
 
29,594

 
(54,077
)
 
2,390

 
(22,093
)
Total derivative instruments recorded on the balance sheet
 
$
99,045

 
$
(229,790
)
 
$
44,390

 
$
(86,355
)
Schedule of Assets Pledged as Collateral and Related Offsets [Table Text Block]
The following table presents the Company's collateral outstanding related to its derivative instruments as of September 30, 2015 and December 31, 2014 (in thousands):
 
September 30,
 
December 31,
 
2015
 
2014
Energy commodity derivatives
 
 
 
Cash collateral posted
$
23,093

 
$
20,565

Letters of credit outstanding
26,200

 
14,500

Balance sheet offsetting (cash collateral against net derivative positions)
12,592

 
15,510

 
 
 
 
Interest rate swaps
 
 
 
Cash collateral posted
36,270

 
28,880

Letters of credit outstanding
10,700

 
10,900

Balance sheet offsetting (cash collateral against net derivative positions)
36,270

 
28,880

Certain of the Company’s derivative instruments contain provisions that require the Company to maintain an "investment grade" credit rating from the major credit rating agencies. If the Company’s credit ratings were to fall below “investment grade,” it would be in violation of these provisions, and the counterparties to the derivative instruments could request immediate payment or demand immediate and ongoing collateralization on derivative instruments in net liability positions.
The following table presents the aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position and the amount of additional collateral the Company could be required to post as of September 30, 2015 and December 31, 2014 (in thousands):
 
September 30,
 
December 31,
 
2015
 
2014
Energy commodity derivatives
 
 
 
Liabilities with credit-risk-related contingent features
$
8,436

 
$
12,911

Additional collateral to post
8,433

 
16,227

 
 
 
 
Interest rate swaps
 
 
 
Liabilities with credit-risk-related contingent features
88,975

 
77,568

Additional collateral to post
21,330

 
19,404