Consolidated Statements of Comprehensive Income - Parenthetical - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassification adjustment for (gain) loss on derivative instruments included in net income, tax	$ 60	$ 60	$ 121	$ 121
Reclassification adjustment for (gain) loss on derivative instruments included in discontinued operations, tax	0	(50)	0	93
Amortization of postretirement liability losses included in net periodic benefit cost, tax	420	150	649	318
Foreign currency translation adjustments recognized during the period, tax	6	26	(63)	54
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	(23)	4	(34)	5
Reclassification adjustment for loss (gain) on available-for-sale investments included in net income, tax	$ 15	$ 17	$ 34	$ 17