Basis of Condensed Consolidated Financial Statements (Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 137,286	$ 105,185	$ 82,042
Restricted cash included in other assets	9,494		11,662
Restricted cash included in prepaid expenses and other current assets	368		2,024
Total cash, cash equivalents, and restricted cash	$ 147,148	$ 115,702	$ 95,728	$ 98,250