Indebtedness Indebtedness (Schedule of Maturities) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
2019	$ 45,515
2020	3,883
2021	262,463
2022	603,611
2023	283,817
Thereafter	1,485,361
Long-term Debt	2,684,650
Interest Paid, Excluding Capitalized Interest, Operating Activities	108,200	$ 121,000	$ 163,400
Interest Paid, Capitalized, Investing Activities	$ 27,200	$ 18,900	$ 16,100

Face Value of Debt, Maturity Total

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