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Debt (Revolving Credit and Term Loan Agreements) (Details)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
Jun. 30, 2015
USD ($)
May 06, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2016
USD ($)
Integer
Mar. 31, 2019
USD ($)
Dec. 31, 2015
USD ($)
May 06, 2015
USD ($)
Nov. 20, 2012
USD ($)
Debt Instrument                
Outstanding balance under revolving credit agreement       $ 417,058   $ 440,821    
Revolving Credit Facility                
Debt Instrument                
Outstanding balance under revolving credit agreement       212,605   233,513    
Term Loan                
Debt Instrument                
Outstanding balance under revolving credit agreement       $ 91,250   $ 96,250    
2015 Credit Agreement                
Debt Instrument                
Interest rate at period end       2.19%   1.67%    
Consolidated senior secured indebtedness to consolidated EBITDA, ratio       3.50        
Debt instrument, basis points       1.00        
Number of consecutive quarters | Integer       4        
Consolidated total indebtedness to consolidated EBITDA, ratio       4.00        
Consolidated total leverage ratio       4.25        
Consideration for permitted acquisition under credit agreement       $ 125,000        
Covenant terms, number of full fiscal quarters prior to | Integer       2        
Portion of rent expense under capital leases That is Treated as Interest Expense, ratio       4.00        
Minimum liquidity debt covenant under credit agreement       50.00%        
2015 Credit Agreement | Term Loan                
Debt Instrument                
Quarterly principal payment amounts $ 1,250              
Consolidated senior secured indebtedness to consolidated EBITDA, ratio       3.75        
2015 Credit Agreement | JPMorgan Chase Bank NA as Administrative Agent Bank of America NA and RBS Citizens NA as Co-Syndication Agents                
Debt Instrument                
Line of credit, credit agreement             $ 700,000  
2015 Credit Agreement | JPMorgan Chase Bank NA as Administrative Agent Bank of America NA and RBS Citizens NA as Co-Syndication Agents | Term Loan                
Debt Instrument                
Line of credit increase in maximum borrowing capacity due to accordion feature       $ 900,000        
2015 Credit Agreement | Co-lead Arrangers Bank of America Securities LLC, JP Morgan Securities LLC, and RBS Citizens N.A. and a Syndicate of Lenders | Revolving Credit Facility                
Debt Instrument                
Line of credit, amount outstanding       212,605   $ 233,513    
Remaining borrowing capacity excluding letters of credit       387,395   366,487    
Line of credit, credit agreement       600,000   600,000 600,000 $ 400,000
Available borrowing capacity       381,740   360,587    
Remaining borrowing capacity subject to EBITDA limitations       $ 209,467   259,883    
2015 Credit Agreement | Co-lead Arrangers Bank of America Securities LLC, JP Morgan Securities LLC, and RBS Citizens N.A. and a Syndicate of Lenders | Term Loan                
Debt Instrument                
Line of credit, credit agreement             $ 100,000  
2015 Credit Agreement | Collateral Member One | Line of Credit                
Debt Instrument                
Equity interest In certain foreign subsidiaries       66.00%        
2015 Credit Agreement | Collateral Member Two | Line of Credit                
Debt Instrument                
Equity interest in domestic subsidiaries       100.00%        
2015 Credit Agreement | Minimum | Revolving Credit Facility                
Debt Instrument                
Commitment fee percentage       0.175%        
2015 Credit Agreement | Minimum | Letter of Credit                
Debt Instrument                
Commitment fee percentage       1.25%        
2015 Credit Agreement | Maximum | Revolving Credit Facility                
Debt Instrument                
Commitment fee percentage       0.30%        
2015 Credit Agreement | Maximum | Letter of Credit                
Debt Instrument                
Commitment fee percentage       2.00%        
2015 Credit Agreement | Forecast | Term Loan                
Debt Instrument                
Quarterly principal payment amounts     $ 2,500   $ 1,875      
Final quarterly principal payment   $ 65,000            
Letter of Credit | Co-lead Arrangers Bank of America Securities LLC, JP Morgan Securities LLC, and RBS Citizens N.A. and a Syndicate of Lenders | Revolving Credit Facility                
Debt Instrument                
Letters of credit outstanding amount       $ 5,655   $ 5,900