Indebtedness Indebtedness (Schedule of Maturities) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
2020	$ 3,883
2021	12,463
2022	603,611
2023	253,817
2024	304,036
Thereafter	1,756,325
Long-term Debt	2,934,135
Interest Paid, Excluding Capitalized Interest, Operating Activities	111,800	$ 108,200	$ 121,000
Interest Paid, Capitalized, Investing Activities	$ 26,500	$ 27,200	$ 18,900

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