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Derivatives And Risk Management (Tables)
 12 Months Ended
Dec. 31, 2015
Derivative Instruments and Hedges, Assets [Abstract]  
Energy Commodity Derivatives
 
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
2016
407

 
1,954

 
17,252

 
142,693

 
280

 
2,656

 
3,182

 
112,233

2017
397

 
97

 
675

 
49,200

 
255

 
483

 
1,360

 
26,965

2018
397

 
—

 
—

 
15,118

 
286

 
—

 
1,360

 
2,738

2019
235

 
—

 
305

 
6,935

 
158

 
—

 
1,345

 
—

2020
—

 
—

 
455

 
905

 
—

 
—

 
1,430

 
—

Thereafter
—

 
—

 
—

 
—

 
—

 
—

 
1,060

 
—

 
(1)
Foreign Currency Exchange Contracts
 
2015
 
2014
Number of contracts
24

 
18

Notional amount (in United States dollars)
$
1,463

 
$
5,474

Notional amount (in Canadian dollars)
2,002

 
6,198
Interest Rate Swap Agreements
The following table summarizes the interest rate swaps that the Company has outstanding as of the balance sheet date indicated below (dollars in thousands):
Balance Sheet Date
 
Number of Contracts
 
Notional Amount
 
Mandatory Cash Settlement Date
December 31, 2015
 
6
 
115,000

 
2016
 
 
3
 
45,000

 
2017
 
 
11
 
245,000

 
2018
 
 
2
 
30,000

 
2019
 
 
1
 
20,000

 
2022
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 Consolidated Balance Sheet as of December 31, 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
 
$
2

 
$
(19
)
 
$
—

 
$
(17
)
Interest rate contracts
 
Other property and investments-net
 
23

 
—

 
—

 
23

Interest rate contracts
 
Other current liabilities
 
118

 
(23,262
)
 
3,880

 
(19,264
)
Interest rate contracts
 
Other non-current liabilities and deferred credits
 
1,407

 
(62,236
)
 
30,150

 
(30,679
)
Commodity contracts
 
Current utility energy commodity derivative assets
 
1,236

 
(553
)
 
—

 
683

Commodity contracts
 
Current utility energy commodity derivative liabilities
 
67,466

 
(85,409
)
 
3,675

 
(14,268
)
Commodity contracts
 
Other non-current liabilities and deferred credits
 
6,613

 
(39,033
)
 
10,851

 
(21,569
)
Total derivative instruments recorded on the balance sheet
 
$
76,865

 
$
(210,512
)
 
$
48,556

 
$
(85,091
)
The following table presents the fair values and locations of derivative instruments recorded on the 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 as of December 31 (in thousands):
 
2015
 
2014
Energy commodity derivatives
 
 
 
Cash collateral posted
$
28,716

 
$
20,565

Letters of credit outstanding
28,200

 
14,500

Balance sheet offsetting (cash collateral against net derivative positions)
14,526

 
15,510

 
 
 
 
Interest rate swaps
 
 
 
Cash collateral posted
34,030

 
28,880

Letters of credit outstanding
9,600

 
10,900

Balance sheet offsetting (cash collateral against net derivative positions)
34,030

 
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 December 31 (in thousands):
 
2015
 
2014
Energy commodity derivatives
 
 
 
Liabilities with credit-risk-related contingent features
$
7,090

 
$
12,911

Additional collateral to post
6,980

 
16,227

 
 
 
 
Interest rate swaps
 
 
 
Liabilities with credit-risk-related contingent features
85,498

 
77,568

Additional collateral to post
18,750

 
19,404