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Derivative Financial Instruments (Details)
£ in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2017
GBP (£)
item
Mar. 31, 2017
USD ($)
item
Maximum      
Derivative      
Estimate change in fair value of derivative for assumption of one percentage point change in the interest rate $ 2,000    
Net Investment Hedging | Facility and 2015 Term Loan      
Derivative      
Borrowings designated as hedge of net investment | £   £ 219,000  
Interest rate swap, entered in July 2005, maturity in July 2020 | BMA Swap Index      
Derivative      
Notional amount     $ 44,300
Fair value of interest rate hedge, liabilities     $ (3,301)
Interest rate swap, entered in July 2005, maturity in July 2020 | Cash flow hedge      
Derivative      
Number of interest-rate swap contracts | item   3 3
Interest rate swap, entered in July 2005, maturity in July 2020 | Cash flow hedge | BMA Swap Index      
Derivative      
Fixed Rate/Buy Amount (as a percent)   3.82% 3.82%
Interest rate swap, entered in January 2015, maturity in October 2017 | GBP LIBOR      
Derivative      
Notional amount | £   £ 220,000  
Fair value of interest rate hedge, liabilities     $ (862)
Interest rate swap, entered in January 2015, maturity in October 2017 | Cash flow hedge      
Derivative      
Exchange rate GBP/USD   1.5149 1.5149
Interest rate swap, entered in January 2015, maturity in October 2017 | Cash flow hedge | GBP LIBOR      
Derivative      
Fixed Rate/Buy Amount (as a percent)   1.79% 1.79%
Floating/Exchange Rate Index, percentage   0.975% 0.975%
Currency swap, entered in January 2015, maturity in October 2017      
Derivative      
Notional amount | £   £ 7,500  
Fair value of foreign currency hedge, assets     $ 1,924
Currency swap, entered in January 2015, maturity in October 2017 | Cash flow hedge      
Derivative      
Buy (sell) amount | £   £ 1,100  
Monthly buy (sell) amount     $ 11,300