Contingencies and Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Summary of future minimum lease payments

Future minimum lease payments under leases expiring subsequent to December 31, 2017 are as follows:

($ in thousands)	As of December 31, 2017
	2018		2019		2020		2021		2022		2023- 2027		2028 and beyond
Minimum operating lease payments	$	2,707	$	2,516	$	1,697	$	1,180	$	1,177	$	483	$	—