Basis of Condensed Consolidated Financial Statements (Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 88,238	$ 85,271	$ 97,884
Restricted cash included in other assets	11,616	9,967	10,355
Restricted cash included in prepaid expenses and other current assets	2,002	3,012	1,070
Total cash, cash equivalents and restricted cash	$ 101,856	$ 98,250	$ 109,309	$ 132,154