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LONG-TERM DEBT (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 01, 2019
Feb. 28, 2019
Jan. 31, 2019
Jan. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt instrument                  
Line of credit         $ 79,045,000   $ 79,045,000   $ 177,727,000
Unamortized financing costs         1,612,000   1,612,000   $ 2,216,000
Junior Subordinated Debt                  
Debt instrument                  
Interest rate percentage       6.375%          
Face amount       $ 400,000,000.0          
Proceeds from issuance of debt       394,900,000          
Prior Credit Facility | Line of Credit                  
Debt instrument                  
Maximum borrowing capacity         1,500,000,000   1,500,000,000    
Outstanding balance         159,000,000.0   159,000,000.0    
Line of credit         $ 79,000,000.0   $ 79,000,000.0    
Weighted average interest rate         3.80%   3.80%    
6.050% Notes Due January 2018                  
Debt instrument                  
Principal amount repaid       $ 300,000,000.0          
Interest rate percentage       6.05%          
Term Loan                  
Debt instrument                  
Principal amount repaid     $ 250,000,000.0            
Face amount         $ 250,000,000   $ 250,000,000    
5.500% Notes Due August 2019                  
Debt instrument                  
Principal amount repaid   $ 275,000,000.0              
Interest rate percentage   5.50%              
Loss on early extinguishment of debt   $ 4,000,000.0     $ 0 $ 0 $ 4,020,000 $ 0  
Make-whole payment   3,600,000              
Unamortized financing costs   $ 400,000              
LIBOR | Junior Subordinated Debt                  
Debt instrument                  
Variable rate       4.02%          
Subsequent event | Line of Credit                  
Debt instrument                  
Maximum borrowing capacity $ 2,850,000,000                
Subsequent event | Revolving Credit Facility | Line of Credit                  
Debt instrument                  
Maximum borrowing capacity 600,000,000                
Subsequent event | Term Loan Credit Facility | Line of Credit                  
Debt instrument                  
Maximum borrowing capacity $ 2,250,000,000                
Percentage of principal amortized annually 1.00%                
Subsequent event | Prior Credit Facility | Line of Credit                  
Debt instrument                  
Principal amount repaid $ 1,500,000,000                
Subsequent event | LIBOR | Revolving Credit Facility | Line of Credit                  
Debt instrument                  
Variable rate 1.25%                
Subsequent event | LIBOR | Term Loan Credit Facility | Line of Credit                  
Debt instrument                  
Variable rate 2.75%                
Subsequent event | Base rate | Revolving Credit Facility | Line of Credit                  
Debt instrument                  
Variable rate 0.25%                
Subsequent event | Base rate | Term Loan Credit Facility | Line of Credit                  
Debt instrument                  
Variable rate 1.75%                
Minimum | Subsequent event | Revolving Credit Facility | Line of Credit                  
Debt instrument                  
Commitment fee percentage 0.15%                
Minimum | Subsequent event | LIBOR | Revolving Credit Facility | Line of Credit                  
Debt instrument                  
Variable rate 1.00%                
Minimum | Subsequent event | Base rate | Revolving Credit Facility | Line of Credit                  
Debt instrument                  
Variable rate 0.00%                
Maximum | Subsequent event | Revolving Credit Facility | Line of Credit                  
Debt instrument                  
Commitment fee percentage 0.40%                
Maximum | Subsequent event | LIBOR | Revolving Credit Facility | Line of Credit                  
Debt instrument                  
Variable rate 2.00%                
Maximum | Subsequent event | Base rate | Revolving Credit Facility | Line of Credit                  
Debt instrument                  
Variable rate 1.00%                
Interest rate swap | Subsequent event                  
Debt instrument                  
Notional amount $ 1,690,000,000