Short-Term Financing (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Schedule of Outstanding Short-Term Financing

	Outstanding Balance				Weighted Average Interest Rate
	December 31,		December 31,		December 31,		December 31,
(Dollars in thousands)	2018		2017		2018		2017
Commercial paper (secured)	$	49,953	$	49,974	3.38	%	2.32	%
Prime broker arrangement	—		239,963		N/A		2.23	%
Total short-term financing	$	49,953	$	289,937