Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Condensed Consolidating Statements Of Cash Flows
Net cash provided by (used for) operating activities	$ 201,772	$ 273,085
Cash flows from investing activities:
Purchases of investments	(16)	(4,572)
Sales and maturities of investments	1,861	11,919
Cash paid for acquisition of businesses, net of cash acquired		(2,929)
Capital expenditures	(106,766)	(274,479)
Proceeds from sales of assets and insurance claims	12,772	11,857
Net cash (used for) provided by investing activities	(92,149)	(258,204)
Cash flows from financing activities:
Reduction of long-term debt	(1,218,622)	(361,966)
Debt issuance costs	(16,023)	(49)
Proceeds from revolving credit facilities	1,240,000	790,000
Reduction in revolving credit facilities	(1,035,000)	(480,000)
Proceeds from (payments for) short-term borrowings		229
Dividends to common and preferred shareholders	(15,232)	(33,705)
Distributions to noncontrolling interest	(1,005)	(814)
Other changes	(1,576)	(2,337)
Repurchase of common and preferred shares	(13,858)
Net cash (used for) provided by financing activities	(61,316)	(88,642)
Effect of exchange rate changes on cash and cash equivalents	(3,336)	(1,968)
Net increase (decrease) in cash, cash equivalents and restricted cash	44,971	(75,729)
Cash and cash equivalents and restricted cash, beginning of period	442,038	451,080
Cash and cash equivalents and restricted cash, end of period	$ 487,009	$ 375,351

Amount of cash outflow in the form dividends of common stock and preferred shareholders

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It represents the Proceeds from (payments for) short-term borrowings.

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The aggregate cash inflow from a) the sale of property, plant and equipment, software, and other intangible assets; and b) the amounts received by the insured under the terms of an insurance contract settlement.

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of increase (decrease) from effect of exchange rate changes on cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; held in foreign currencies; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The cash outflow to reacquire preferred stock during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Amount of cash inflow (outflow) from financing activities classified as other.

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The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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