Long-Term Loans (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Details of Leverage Ratio

The margin varies quarterly based on the Leverage (as defined in the U.K. Facilities Agreement as a measure of the ratio of the SD U.K. Group Total Net Debt to SD U.K. Group EBITDA, each as defined in the U.K. Facilities Agreement) of the SD U.K. Group as follows.

Leverage of the SD U.K. Group	Term Loan Margin % per annum		RCF % per annum
Greater than 2.0 : 1		1.90		1.90
Less than or equal to 2.0 : 1 but greater than 1.5 : 1		1.60		1.60
Less than or equal to 1.5 : 1 but greater than 1.25 : 1		1.45		1.45
Less than or equal to 1.25 : 1 but greater than 1.0 : 1		1.30		1.30
Less than or equal to 1.0 : 1		1.15		1.15

Schedule of Annual Principal Payments

Commencing in 2018, the required annual principal payments based on the amortization schedule of the loan as of December 31, 2017 without giving effect to any voluntary prepayments, are as follows:

	$ in thousands
Year ending December 31:
2018		16,364
2019		16,364
2020		40,908
		73,636