Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net earnings	$ 8,037	$ 20,864	$ 15,552	$ 39,310
Defined benefit pension and other postretirement employee benefits:
Amortization of actuarial loss included in net periodic cost, net of tax of $248, $1,233, $1,113, and $3,700	357	427	988	1,339
Amortization of prior service credit included in net periodic cost, net of tax of $(165), $(206), $(497), and $(617)	(231)	(256)	(461)	(513)
Other comprehensive income (loss), net of tax	126	171	527	826
Comprehensive income	$ 8,163	$ 21,035	$ 16,079	$ 40,136