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SUBSEQUENT EVENTS (Details)
£ / shares in Units, $ in Thousands, £ in Millions
3 Months Ended 9 Months Ended
Oct. 02, 2017
USD ($)
Oct. 02, 2017
GBP (£)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Oct. 31, 2017
USD ($)
Aug. 24, 2017
£ / shares
Jul. 05, 2017
£ / shares
Subsequent Event [Line Items]                  
Transaction related expenses     $ 5,970 $ 0 $ 5,970 $ 0      
Novae [Member]                  
Subsequent Event [Line Items]                  
Share price (in gpb per shares) | £ / shares               £ 715 £ 700
Subsequent Event [Member] | Novae [Member]                  
Subsequent Event [Line Items]                  
Consideration transferred $ 615,600 £ 462.9              
Loss from Catastrophes [Member] | Fire [Member] | Minimum [Member] | Subsequent Event [Member]                  
Subsequent Event [Line Items]                  
Estimate of loss             $ 35,000    
Loss from Catastrophes [Member] | Fire [Member] | Maximum [Member] | Subsequent Event [Member]                  
Subsequent Event [Line Items]                  
Estimate of loss             $ 45,000