Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments And Contingencies Disclosure [Abstract]

Future Minimum Rental Commitments Under Non-cancellable Operating Leases

At December 31, 2018, future minimum rental commitments under non-cancellable operating leases are as follows ($ in thousands):

Year	Amount
2019	$	8,680
2020		8,063
2021		7,274
2022		6,680
2023		5,788
Thereafter		29,673
Total	$	66,158