Consolidated Condensed Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net Income (Loss)	$ (7,953)	$ 83,067	$ 45,363	$ 139,759
Other comprehensive income (loss):
Total cash flow hedges	(2,698)	13,659	(5,035)	(23,611)
Pension and postretirement plans:
Amortization of net benefit obligation at transition, net of tax of $3, $26, $7 and $52, respectively	6	47	12	95
Amortization of prior service cost, net of tax of $26, $28, $52 and $55, respectively	48	51	96	102
Amortization of net loss, including settlement charges, net of tax of $577, $734, $3,571 and $1,654, respectively	1,072	1,363	6,631	3,071
Current period change in fair value of pension and postretirement plans, net of tax of ($1,151) and $0, respectively	(2,136)	0	(2,136)	0
Total pension and postretirement plans	(1,010)	1,461	4,603	3,268
Comprehensive Income (Loss)	(11,661)	98,187	44,931	119,416
Inventories			(1,411)	8,038
Commodity contracts
Other comprehensive income (loss):
Current period change in fair value of derivative commodity instruments, net of tax of $6, $9,713, $7 and ($6,712), respectively	9	15,847	11	(10,951)
Reclassification adjustment for derivative commodity instruments, net of tax of ($2,179), ($1,711), ($3,720) and ($8,281), respectively	(3,556)	(2,792)	(6,069)	(13,511)
Current period change in fair value of interest rate swap, net of tax of ($98), $176, ($160) and $165, respectively	9	15,847	11	(10,951)
Reclassification adjustment for interest rate swap, net of tax of $556, $149, $712 and $292, respectively	(3,556)	(2,792)	(6,069)	(13,511)
Interest rate swap
Other comprehensive income (loss):
Current period change in fair value of derivative commodity instruments, net of tax of $6, $9,713, $7 and ($6,712), respectively	(183)	327	(298)	307
Reclassification adjustment for derivative commodity instruments, net of tax of ($2,179), ($1,711), ($3,720) and ($8,281), respectively	1,032	277	1,321	544
Current period change in fair value of interest rate swap, net of tax of ($98), $176, ($160) and $165, respectively	(183)	327	(298)	307
Reclassification adjustment for interest rate swap, net of tax of $556, $149, $712 and $292, respectively	$ 1,032	$ 277	$ 1,321	$ 544