Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) [Abstract]
Net income	$ 1,958	$ 1,766	$ 28,532	$ 25,802
Other comprehensive income:
Change in unrecognized pension and post-retirement benefit costs	0	0	28	0
Income tax (provision) benefit on change in unrecognized pension and post-retirement benefit costs	(30)	13	(21)	(3)
Foreign currency translation adjustments	(7,003)	(5,602)	(10,721)	(3,475)
Income tax benefit on foreign currency translation adjustments	868	484	808	547
Other comprehensive loss	(6,165)	(5,105)	(9,906)	(2,931)
Comprehensive income (loss)	(4,207)	(3,339)	18,626	22,871
Comprehensive loss attributable to non-controlling interest	(607)	(472)	(1,285)	(281)
Comprehensive income (loss) attributable to controlling interest	$ (3,600)	$ (2,867)	$ 19,911	$ 23,152