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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]
Proceeds from Income Tax Refunds	$ 25,991	$ 7,438	$ 21,459
Income taxes (net of refunds of $25,991, $7,438 and $21,459 in 2020, 2019 and 2018, respectively)(a)	52,103	170,450	157,758
Interest (net of capitalization)	66,379	45,532	49,762
Capital expenditures included in Accounts payable	$ 139,120	$ 199,451	$ 134,784

X

- Definition

Future cash outflow to pay for purchases of fixed assets that have occurred.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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