Accrued Liabilities (Components Of Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other Liabilities Disclosure [Abstract]
Compensated absences	$ 46,421	$ 40,254
Employee benefits	40,203	38,761
Wages and salaries	35,826	29,451
Variable compensation	33,573	50,713
Taxes other than income taxes	26,704	23,930
Interest	17,579	17,607
Other	28,772	52,493
Total accrued liabilities	$ 229,078	$ 253,209