Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Property, Plant and Equipment [Line Items]
Restricted Cash and Cash Equivalents	$ 19,300	$ 21,500
Restricted Cash included in other current assets	2,404	3,100	$ 2,819
Restricted Cash included in other assets	$ 16,883	$ 18,400	$ 20,124