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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 59,379	$ 42,694	$ 54,434
Foreign currency translation adjustments	11,358	(10,160)	(17,227)
Net change in:
Deferred gains (losses) on cash flow hedges, net of taxes of $638, $(464), and $0, respectively	(1,609)	1,185
Unrecognized retirement obligations, net of taxes of $3,914, $22,672, and $(9,905), respectively	(6,974)	(36,519)	15,865
Other comprehensive income (loss)	2,775	(45,494)	(1,362)
Comprehensive income (loss)	$ 62,154	$ (2,800)	$ 53,072

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