CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net gain from curtailment, tax	$ 11,384	$ 0	$ 0
Net actuarial gain (loss), tax	11,892	(3,709)	(10,804)
Pension settlement expense, tax	821	0	438
Amortization of net periodic benefit costs, tax	3,014	4,354	2,789
Change in foreign currency translation, tax	(79)	10	(69)
Other, tax	$ 0	$ 0	$ (70)