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Long-Term Debt and Related Matters - Narrative - North America (Details)
3 Months Ended 12 Months Ended
Apr. 30, 2019
USD ($)
Nov. 07, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Jun. 29, 2016
USD ($)
Line of Credit Facility          
Term loan     $ 0 $ 23,750,000  
Line of credit facility, amount outstanding     $ 74,008,000 33,868,000  
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company          
Line of Credit Facility          
Line of credit facility, maximum borrowing capacity $ 195,000,000       $ 140,000,000
Term loan   $ 25,000,000      
Leverage ratio in effect for the eighth quarter and remainder of a credit agreement   25,000,000      
EBITDA required       $ 3.25  
Fixed charge coverage ratio     3.50    
Fixed charge coverage ratio after fifth quarter       1.40  
Minimum Consolidated Fixed Charge Coverage Ratio       1.25  
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Revolving Credit Facility          
Line of Credit Facility          
Line of credit facility, amount outstanding     $ 425,000 $ 492,000  
Line of credit facility, current borrowing capacity     $ 120,567,000 $ 105,640,000  
Line of Credit Facility, Potential Increase To Borrowing Capacity $ 50,000,000        
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Revolving Credit Facility | Euro-rate          
Line of Credit Facility          
Debt instrument, basis spread on variable rate 100.00%        
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Revolving Credit Facility | Euro-rate | Minimum          
Line of Credit Facility          
Debt instrument, basis spread on variable rate 125.00%        
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Revolving Credit Facility | Euro-rate | Maximum          
Line of Credit Facility          
Debt instrument, basis spread on variable rate 225.00%        
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Revolving Credit Facility | Base Rate | Minimum          
Line of Credit Facility          
Debt instrument, basis spread on variable rate 25.00%        
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Revolving Credit Facility | Base Rate | Maximum          
Line of Credit Facility          
Debt instrument, basis spread on variable rate 12500.00%        
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Revolving Credit Facility | Prime Rate          
Line of Credit Facility          
Debt instrument, basis spread on variable rate 50.00%