Interest Expense Components of Interest Expense (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Banking and Thrift [Abstract]
Interest Expense, Borrowings		$ 8,897	$ 879	$ 22,675	$ 1,784
Amortization of Debt Discount (Premium)	[1]	172	0	505	0
Amortization of Debt Issuance Costs		693	374	2,004	1,362
Interest Paid, Capitalized, Investing Activities		(2,440)	(51)	(7,111)	(132)
Interest Expense		$ 7,322	$ 1,202	$ 18,073	$ 3,014

[1] Attributable to the Second Lien Facility (see Note 8).