Condensed Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Condensed Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net income	$ 1,766	$ 6,527	$ 25,802	$ 30,930
Other comprehensive income
Change in unrecognized pension and post-retirement benefit costs	0	0	0	2
Income tax (provision) benefit on change in unrecognized pension and post-retirement benefit costs	13	(4)	(3)	54
Foreign currency translation adjustments	(5,602)	(168)	(3,475)	(6,984)
Income tax benefit on foreign currency translation adjustments	484	118	547	1,111
Other comprehensive loss	(5,105)	(54)	(2,931)	(5,817)
Comprehensive income (loss)	(3,339)	6,473	22,871	25,113
Comprehensive loss attributable to non-controlling interest	(472)	(40)	(281)	(297)
Comprehensive income (loss) attributable to controlling interest	$ (2,867)	$ 6,513	$ 23,152	$ 25,410