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ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES.
Accounts payable, principally trade	$ 108,973	$ 123,818
Accrued employee compensation costs	114,721	95,330
Unearned income	17,164	15,800
Other accrued liabilities	94,323	92,808
Total	$ 335,181	$ 327,756

Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. 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).

+ References+ Details