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Bank Debt (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
Dec. 31, 2016
USD ($)
Line of Credit Facility [Line Items]      
Maturity period of bank borrowings 5 years    
Revolving credit facility $ 400,000    
Maturity date of bank borrowings Mar. 28, 2022    
Maximum borrowing capacity $ 500,000    
Aggregate bank borrowings 178,336   $ 135,030
Additional bank borrowings $ 217,800    
Credit agreement, average borrowing rate 2.70% 2.30%  
Letter of Credit [Member]      
Line of Credit Facility [Line Items]      
Additional bank borrowings $ 3,900    
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Consolidated leverage ratio 1.1    
Consolidated interest coverage ratio 29.4    
Revolving Credit Facility [Member] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Consolidated interest coverage ratio 2.0    
Revolving Credit Facility [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Consolidated leverage ratio 3.5    
LIBOR [Member]      
Line of Credit Facility [Line Items]      
Debt facility, applicable margin 1.00%    
LIBOR [Member] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Debt facility, applicable margin 1.00%    
LIBOR [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Debt facility, applicable margin 2.00%    
Base Rate [Member]      
Line of Credit Facility [Line Items]      
Debt facility, applicable margin 0.00%    
Base Rate [Member] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Debt facility, applicable margin 0.00%    
Base Rate [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Debt facility, applicable margin 1.00%