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	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 77,315	$ 73,228	$ 82,522
Restricted Cash and Cash Equivalents, Current	7,883	35,051	22,641
Restricted Cash, Noncurrent	4,200		8,735
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 89,398	$ 111,369	$ 113,898	$ 149,681