CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 123,330	$ 111,332	$ 100,711
Other comprehensive earnings (loss), net of tax
Foreign currency translation adjustments	(2,906)	656	(708)
Pension and other postretirement benefit plans	28,102	(9,533)	(14,892)
Other comprehensive loss	25,196	(8,877)	(15,600)
Comprehensive earnings	$ 148,526	$ 102,455	$ 85,111