Other Assets (Details 1) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Prepaid Expense	$ 8,746	$ 6,801
Deferred Tax Assets, Net, Current	0	2,244
Other Assets, Miscellaneous, Current	5,551	9,585
Other Assets, Current	$ 14,297	$ 18,630