Restricted Cash (Tables)

12 Months Ended

Dec. 31, 2020

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]

Schedule Of Cash And Cash Equivalents [Table Text Block]

2020

2019

2018

2017

Cash and cash equivalents

$

181,833

$

123,524

$

104,147

$

89,879

Restricted cash included in other current assets

62

353

—

—

Restricted cash included in other assets

—

19,678

20,278

21,171

Cash, cash equivalents and restricted cash

$

181,895

$

143,555

$

124,425

$

111,050