Indebtedness Indebtedness (Schedule of Maturities) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
2021	$ 4,413
2022	88,386
2023	549,893
2024	305,155
2025	5,102
Thereafter	2,461,396
Long-term Debt	3,414,345
Interest Paid, Excluding Capitalized Interest, Operating Activities	104,600	$ 111,800	$ 108,200
Interest Paid, Capitalized, Investing Activities	$ 24,300	$ 26,500	$ 27,200

Face Value of Debt, Maturity Total

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