Prepaids and Other Current Assets Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Prepaid Expense and Other Assets, Current [Abstract]
Deposit Assets	$ 21,940	$ 0
Other Prepaid Expense, Current	4,208	2,948
Prepaid insurance and property taxes	2,580	1,649
Prepaid other taxes	8,097	1,018
Deferred tax charge	1,326	0
Other Assets, Current	3,135	1,740
Prepaid Expense and Other Assets, Current	$ 41,286	$ 7,355