Interest Expense Components of Interest Expense (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Banking and Thrift [Abstract]
Interest Expense, Borrowings		$ 7,730	$ 515	$ 13,778	$ 905
Amortization of Debt Discount (Premium)	[1]	168	0	333	0
Amortization of Debt Issuance Costs		680	800	1,311	988
Interest Paid, Capitalized, Investing Activities		(2,428)	(41)	(4,671)	(81)
Interest Expense		$ 6,150	$ 1,274	$ 10,751	$ 1,812

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