Consolidated Statements of Comprehensive Income - Parenthetical - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification adjustment for (gain) loss on derivative instruments included in net income, tax	$ 60	$ 60	$ 181	$ 181
Reclassification adjustment for (gain) loss on derivative instruments included in discontinued operations, tax	0	(10)	0	83
Amortization of postretirement liability losses included in net periodic benefit cost, tax	233	159	881	477
Foreign currency translation adjustments recognized during the period, tax	(44)	(89)	(107)	(36)
Reclassification adjustment for foreign currency translation (gain) loss included in net income, tax	0	0	491	0
Net unrealized gain (loss) on available-for-sale investments arising during the period, tax	(19)	(33)	(57)	(48)
Reclassification adjustment for loss (gain) on available-for-sale investments included in net income, tax	$ 15	$ 16	$ 53	$ 54