Cash Flows (Summary of Non-Cash Activities and Other Supplemental Data) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Non-Cash Investing and Financing Activities:
Treasury stock not yet settled	$ 0	$ 832
Finance lease additions	14,266	0
Capital expenditures incurred but not yet paid	1,906	1,731
Supplemental Data:
Cash interest paid	68,129	76,664
Income taxes paid, net	$ 29,723	$ 77,985

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

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Amount of increase in lease obligation from new lease.

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