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Derivative Financial Instruments (Details)
£ in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
GBP (£)
item
Jun. 30, 2016
USD ($)
item
Derivative            
Gains or losses recorded to accumulated other comprehensive loss reclassified to earnings     $ 0      
Cash flow hedge | Reclassification out of Accumulated Other Comprehensive Income | Other income, net            
Effects of Change in Interest Rates            
Reclassification of unrealized gains into other income (expense), ineffectiveness $ 200 $ 200 300 $ 300    
Net Investment Hedging | Facility and 2012 Term Loan            
Derivative            
Borrowings designated as hedge of net investment | £         £ 268,000  
Interest rate swap, entered in July 2005, maturity in July 2020            
Effects of Change in Interest Rates            
+50 Basis Points     994      
-50 Basis Points     (735)      
+100 Basis Points     1,858      
-100 Basis Points     (1,600)      
Interest rate swap, entered in July 2005, maturity in July 2020 | BMA Swap Index            
Derivative            
Notional amount           $ 45,600
Fair value of hedge, liabilities           $ (5,410)
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 November 2008, maturity in October 2016            
Effects of Change in Interest Rates            
+50 Basis Points     33      
-50 Basis Points     (40)      
+100 Basis Points     69      
-100 Basis Points     (76)      
Interest rate swap, entered in November 2008, maturity in October 2016 | LIBOR            
Derivative            
Notional amount           $ 24,700
Fair value of hedge, liabilities           $ (286)
Interest rate swap, entered in November 2008, maturity in October 2016 | Cash flow hedge | LIBOR            
Derivative            
Fixed Rate/Buy Amount (as a percent)         5.95% 5.95%
Floating/Exchange Rate Index, percentage         1.50% 1.50%
Interest rate swap, entered in January 2015, maturity in October 2017            
Effects of Change in Interest Rates            
+50 Basis Points     1,893      
-50 Basis Points     (2,037)      
+100 Basis Points     3,858      
-100 Basis Points     (4,003)      
Interest rate swap, entered in January 2015, maturity in October 2017 | GBP LIBOR            
Derivative            
Notional amount | £         £ 220,000  
Fair value of hedge, liabilities           $ (2,162)
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 | £         £ 16,800  
Fair value of foreign currency hedge, assets           $ 3,017
Effects of Change in Interest Rates            
+50 Basis Points     (225)      
-50 Basis Points     1      
+100 Basis Points     (338)      
-100 Basis Points     $ 114      
Currency swap, entered in January 2015, maturity in October 2017 | Cash flow hedge            
Derivative            
Buy (sell) amount | £         £ 1,000  
Monthly buy (sell) amount           $ 25,500