Accumulated Other Comprehensive (Loss) Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Changes in accumulated balances for each classification of comprehensive (loss) income
Balance at the end of the period	$ (32,817)	$ (17,527)
Foreign Currency Items
Changes in accumulated balances for each classification of comprehensive (loss) income
Balance at the beginning of the period	(8,833)	7,492	(37,812)
Change during period	(11,860)	(16,325)	45,304
Balance at the end of the period	(20,693)	(8,833)	7,492
Unrealized Gains (Losses) on Securities
Changes in accumulated balances for each classification of comprehensive (loss) income
Balance at the beginning of the period	73		111
Change during period	(73)		(38)
Balance at the end of the period			73
Derivative Financial Instruments
Changes in accumulated balances for each classification of comprehensive (loss) income
Balance at the beginning of the period	(1,480)	(2,415)	(4,901)
Change during period	1,480	935	2,486
Change in LNS derivative financial instrument	382
Balance at the end of the period	382	(1,480)	(2,415)
Income taxes amount	(1,008)	(623)	1,631
Accumulated Other Comprehensive (Loss) Income
Changes in accumulated balances for each classification of comprehensive (loss) income
Balance at the beginning of the period	(17,527)	(2,584)	(48,926)
Change during period	(15,451)	(15,333)	45,948
Change in LNS derivative financial instrument	382
Reclassified into operations	221	(390)	(394)
Balance at the end of the period	(32,817)	(17,527)	(2,584)
Unrecognized pension benefit costs, net of taxes
Changes in accumulated balances for each classification of comprehensive (loss) income
Balance at the beginning of the period	(7,287)	(7,734)	(6,324)
Change during period	(4,998)	57	(1,804)
Reclassified into operations	221	(390)	(394)
Balance at the end of the period	(12,506)	(7,287)	(7,734)
Income taxes amount	$ (1,584)	$ 306	$ (667)