Cash Flow Information Cash and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	$ 89,213	$ 15,348
Restricted Cash	15,110	18,605
Restricted Cash and Cash Equivalents	$ 104,323	$ 33,953	$ 39,804	$ 29,865