Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Taxes on Change in unrecognized benefit plan losses arising during the period	$ 0	$ 1,303	$ 2,367	$ (434)
Taxes on Adjustment for previously unrecognized benefit plan losses included in net income	(28)	2	(85)	7
Taxes on Change in unrealized holding gain arising during the period	341	(1,152)	1,026	(2,340)
Taxes on Change in foreign currency translation adjustments	$ (103)	$ (741)	$ (1,198)	$ (1,148)