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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]  
Future Minimum Rental Commitments Under Non-cancellable Operating Leases

At December 31, 2015, future minimum rental commitments under non-cancellable operating leases are as follows ($ in thousands):

 

Year

 

Amount

 

2016

 

$

8,354

 

2017

 

 

7,773

 

2018

 

 

6,750

 

2019

 

 

5,445

 

2020

 

 

4,905

 

Thereafter

 

 

11,348

 

Total

 

$

44,575