Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Commitments And Contingencies Disclosure [Abstract]

Future Minimum Rental Commitments Under Non-cancellable Operating Leases

At December 31, 2016, future minimum rental commitments under non-cancellable operating leases are as follows ($ in thousands):

Year	Amount
2017	$	9,561
2018		7,654
2019		6,458
2020		5,576
2021		4,190
Thereafter		24,611
Total	$	58,050