Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income	$ 252,515	$ (76,230)	$ 538,783	$ 119,034
Other comprehensive income (loss):
Unrealized gain on available for sale securities	(160)	13	(75)	7
Net gain (loss) on pension and other postretirement benefits	242	108	691	324
Total other comprehensive income (loss)	82	121	616	331
Comprehensive income	$ 252,597	$ (76,109)	$ 539,399	$ 119,365