Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Taxes on Change in unrecognized benefit plan losses arising during the period	$ 2,367	$ (1,737)	$ 2,367	$ (1,737)
Taxes on Adjustment for previously unrecognized benefit plan losses included in net income	(20)	8	(57)	5
Taxes on Change in unrealized holding gain arising during the period	909	(583)	685	(1,188)
Taxes on Change in foreign currency translation adjustments	$ (1,161)	$ 766	$ (1,095)	$ (407)