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Derivatives And Risk Management (Tables)
 3 Months Ended
Mar. 31, 2016
Derivative Instruments and Hedges, Assets [Abstract]  
Energy Commodity Derivatives
The following table presents the underlying energy commodity derivative volumes as of March 31, 2016 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
2016
213

 
1,643

 
13,846

 
127,565

 
200

 
1,916

 
968

 
104,118

2017
397

 
97

 
1,265

 
58,238

 
255

 
483

 
1,360

 
41,918

2018
397

 
—

 
—

 
23,903

 
286

 
192

 
1,360

 
6,363

2019
235

 
—

 
610

 
10,245

 
158

 
—

 
1,345

 
—

2020
—

 
—

 
910

 
1,815

 
—

 
—

 
1,430

 
—

Thereafter
—

 
—

 
—

 
—

 
—

 
—

 
1,060

 
—

 
The following table presents the underlying energy commodity derivative volumes as of December 31, 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
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

 
—
Foreign Currency Exchange Contracts
The following table summarizes the foreign currency derivatives that the Company has outstanding as of March 31, 2016 and December 31, 2015 (dollars in thousands):
 
March 31,
 
December 31,
 
2016
 
2015
Number of contracts
24

 
24

Notional amount (in United States currency)
$
2,787

 
$
1,463

Notional amount (in Canadian currency)
3,700

 
2,002
Interest Rate Swap Agreements
The following table summarizes the interest rate swaps that the Company has entered into as of March 31, 2016 and December 31, 2015 (dollars in thousands):
Balance Sheet Date
 
Number of Contracts
 
Notional Amount
 
Mandatory Cash Settlement Date
March 31, 2016
 
6
 
115,000

 
2016
 
 
4
 
55,000

 
2017
 
 
13
 
265,000

 
2018
 
 
3
 
40,000

 
2019
 
 
4
 
50,000

 
2022
December 31, 2015
 
6
 
115,000

 
2016
 
 
3
 
45,000

 
2017
 
 
11
 
245,000

 
2018
 
 
2
 
30,000

 
2019
 
 
1
 
20,000

 
2022
Derivative Instruments Summary
The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of March 31, 2016 (in thousands):
 
 
 
 
Fair Value as of March 31, 2016
Derivative
 
Balance Sheet Location
 
Gross
Asset
 
Gross
Liability
 
Collateral
Netted
 
Net Asset
(Liability)
on Balance
Sheet
Foreign currency contracts
 
Other current assets
 
$
64

 
$
—

 
$
—

 
$
64

Interest rate contracts
 
Other property and investments-net and other non-current assets
 
451

 
—

 
—

 
451

Interest rate contracts
 
Other current liabilities
 
—

 
(38,802
)
 
10,558

 
(28,244
)
Interest rate contracts
 
Other non-current liabilities and deferred credits
 
443

 
(106,607
)
 
65,442

 
(40,722
)
Commodity contracts
 
Current utility energy commodity derivative assets
 
127

 
—

 
—

 
127

Commodity contracts
 
Non-current utility energy commodity derivative assets
 
136

 
(51
)
 
—

 
85

Commodity contracts
 
Current utility energy commodity derivative liabilities
 
68,153

 
(91,109
)
 
12,261

 
(10,695
)
Commodity contracts
 
Other non-current liabilities and deferred credits
 
7,967

 
(33,886
)
 
7,711

 
(18,208
)
Total derivative instruments recorded on the balance sheet
 
$
77,341

 
$
(270,455
)
 
$
95,972

 
$
(97,142
)
The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of December 31, 2015 (in thousands):
 
 
 
 
Fair Value as of December 31, 2015
Derivative
 
Balance Sheet Location
 
Gross
Asset
 
Gross
Liability
 
Collateral
Netted
 
Net Asset
(Liability)
on Balance
Sheet
Foreign currency contracts
 
Other current liabilities
 
$
2

 
$
(19
)
 
$
—

 
$
(17
)
Interest rate contracts
 
Other property and investments-net and other non-current assets
 
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
)
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 March 31, 2016 and December 31, 2015 (in thousands):
 
March 31,
 
December 31,
 
2016
 
2015
Energy commodity derivatives
 
 
 
Cash collateral posted
$
29,618

 
$
28,716

Letters of credit outstanding
23,700

 
28,200

Balance sheet offsetting (cash collateral against net derivative positions)
19,972

 
14,526

 
 
 
 
Interest rate swap derivatives
 
 
 
Cash collateral posted
76,000

 
34,030

Letters of credit outstanding
16,700

 
9,600

Balance sheet offsetting (cash collateral against net derivative positions)
76,000

 
34,030

There was no cash collateral or letters of credit outstanding as of March 31, 2016 and December 31, 2015 related to foreign currency exchange derivatives.
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 March 31, 2016 and December 31, 2015 (in thousands):
 
March 31,
 
December 31,
 
2016
 
2015
Energy commodity derivatives
 
 
 
Liabilities with credit-risk-related contingent features
$
1,655

 
$
7,090

Additional collateral to post
1,416

 
6,980

 
 
 
 
Interest rate swap derivatives
 
 
 
Liabilities with credit-risk-related contingent features
145,409

 
85,498

Additional collateral to post
25,420

 
18,750