Description of Business and Summary of Significant Accounting Policies Cash, Cash Equivalents, and Restricted Cash Shown in the Statement of Cash Flows (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 61,854	$ 73,228	$ 64,189
Restricted Cash and Cash Equivalents, Current	24,756	35,051	29,743
Restricted Cash, Noncurrent	2,388		4,005
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 88,998	$ 111,369	$ 97,937	$ 149,681