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Restricted Cash (Tables)	3 Months Ended
Restricted Cash (Tables)	Mar. 31, 2021
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]
Schedule Of Cash And Cash Equivalents [Table Text Block]	March 31, December 31, 2021 2020 2020 2019 Cash and cash equivalents $ 163,455 $ 316,437 $ 181,833 $ 123,524 Restricted cash included in other current assets — 34 62 353 Restricted cash included in other assets — 19,480 — 19,678 Cash, cash equivalents and restricted cash $ 163,455 $ 335,951 $ 181,895 $ 143,555