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Schedule of Cash Flow Hedges (Details)
£ in Thousands, CAD in Thousands, $ in Thousands, € in Millions
Feb. 11, 2016
USD ($)
Jan. 20, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
GBP (£)
Dec. 31, 2015
CAD
Dec. 31, 2014
USD ($)
Dec. 31, 2014
GBP (£)
Dec. 31, 2014
CAD
Dec. 31, 2013
EUR (€)
Dec. 31, 2013
GBP (£)
Derivative                    
Derivative Liabilities, Current     $ 1,347     $ 2,691        
Derivative Liabilities, Noncurrent     0     2,527        
Interest Rate Swap | US Dollar Notional Amount                    
Derivative                    
Derivative, Notional Amount     170,000     420,000        
Derivative Liabilities, Current     858     2,691        
Derivative Liabilities, Noncurrent     0     1,615        
Interest Rate Swap | US Dollar Notional Amount | Subsequent Event [Member]                    
Derivative                    
Derivative, Notional Amount $ 240,000 $ 200,000                
Interest Rate Swap | Pound Sterling Notional Amount                    
Derivative                    
Derivative, Notional Amount | £       £ 50,000     £ 50,000      
Derivative Liabilities, Current     465              
Derivative Liabilities, Noncurrent     0     893        
Interest Rate Swap | Canadian Dollar Notional Amount                    
Derivative                    
Derivative, Notional Amount | CAD         CAD 25,000     CAD 25,000    
Derivative Liabilities, Current     24              
Derivative Liabilities, Noncurrent     $ 0     $ 19        
Foreign Exchange Forward | Pound Sterling Notional Amount                    
Derivative                    
Derivative, Notional Amount | £                   £ 70,000
Foreign Exchange Forward | Euro Notional Amount                    
Derivative                    
Derivative, Notional Amount | €                 € 150