Accrued Liabilities (Components Of Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Other Liabilities Disclosure [Abstract]
Variable compensation	$ 56,698us-gaap_AccruedBonusesCurrent	$ 33,573us-gaap_AccruedBonusesCurrent
Compensated absences	50,325us-gaap_AccruedVacationCurrent	46,421us-gaap_AccruedVacationCurrent
Wages and salaries	43,920us-gaap_AccruedSalariesCurrent	35,826us-gaap_AccruedSalariesCurrent
Employee benefits	37,702us-gaap_AccruedEmployeeBenefitsCurrent	40,203us-gaap_AccruedEmployeeBenefitsCurrent
Taxes other than income taxes	27,861	26,704
Interest	17,555us-gaap_InterestPayableCurrent	17,579us-gaap_InterestPayableCurrent
Other	23,882us-gaap_OtherAccruedLiabilitiesCurrent	28,772us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued liabilities	$ 257,943us-gaap_AccruedLiabilitiesCurrent	$ 229,078us-gaap_AccruedLiabilitiesCurrent

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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