CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Net earnings (loss)	$ 33,439	$ (511,173)	$ (34,509)		$ (543,846)
Other comprehensive income:
Defined benefit postretirement plans - amortization of actuarial losses, net of tax	345	186	687	[1]	373
Total other comprehensive income	345	186	687		373
Total comprehensive income (loss)	$ 33,784	$ (510,987)	$ (33,822)		$ (543,473)

[1] All amounts are net of tax.