Interest Expense Components of Interest Expense (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Banking and Thrift [Abstract]
Interest Expense, Borrowings		$ 9,711	$ 6,048
Amortization of Debt Discount (Premium)	[1]	180	165
Amortization of Debt Issuance Costs		741	631
Interest Paid, Capitalized, Investing Activities		(1,154)	(2,243)
Interest Expense		$ 9,478	$ 4,601

[1] Attributable to the Second Lien Facility (see Note 7).