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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]      
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax $ (19,187) $ (15,585) $ 402
Amount reclassified from accumulated other comprehensive loss 8,790 3,269 5,342
Interest Expense 156,678 151,264 148,456
Amount reclassified from accumulated other comprehensive loss, Early extinguishment of debt 2,472    
Early extinguishment of debt 21,837 11,982 $ 11,172
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 3,700    
Fair Value, Measurements, Recurring [Member]      
Derivative [Line Items]      
Interest Rate Cash Flow Hedge Asset at Fair Value   2,987  
Interest Rate Cash Flow Hedge Liability at Fair Value (9,291) (1,515)  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]      
Derivative [Line Items]      
Interest Rate Cash Flow Hedge Asset at Fair Value   2,987  
Interest Rate Cash Flow Hedge Liability at Fair Value (9,291) (1,515)  
Interest Rate Cash Flow Hedge Derivative At Fair Value Net $ (9,291) 1,472  
Derivative @ 1.053% 265.000M [Member]      
Derivative [Line Items]      
Derivative, Inception Date Aug. 01, 2016    
Derivative, Maturity Date Jan. 05, 2022    
Derivative, Notional Amount $ 265,000    
Derivative, Description of Variable Rate Basis 1 Month LIBOR with Floor    
Derivative, Fixed Interest Rate 1.053%    
Interest Rate Cash Flow Hedge Asset at Fair Value   2,674  
Interest Rate Cash Flow Hedge Liability at Fair Value $ (2,472)    
Derivative @ 1.303% 19.678M [Member]      
Derivative [Line Items]      
Derivative, Inception Date Apr. 07, 2016    
Derivative, Maturity Date Apr. 01, 2023    
Derivative, Notional Amount $ 19,405    
Derivative, Description of Variable Rate Basis 1 Month LIBOR    
Derivative, Fixed Interest Rate 1.303%    
Interest Rate Cash Flow Hedge Asset at Fair Value   148  
Interest Rate Cash Flow Hedge Liability at Fair Value $ (494)    
Derivative @ 1.490% 32.809M [Member]      
Derivative [Line Items]      
Derivative, Inception Date Dec. 01, 2016    
Derivative, Maturity Date Nov. 01, 2023    
Derivative, Notional Amount $ 32,369    
Derivative, Description of Variable Rate Basis 1 Month LIBOR    
Derivative, Fixed Interest Rate 1.49%    
Interest Rate Cash Flow Hedge Asset at Fair Value   84  
Interest Rate Cash Flow Hedge Liability at Fair Value $ (1,181)    
Derivative @ 1.542% 24.000M [Member]      
Derivative [Line Items]      
Derivative, Inception Date Sep. 17, 2019    
Derivative, Maturity Date Mar. 17, 2025    
Derivative, Notional Amount $ 24,000    
Derivative, Description of Variable Rate Basis 1 Month LIBOR    
Derivative, Fixed Interest Rate 1.542%    
Interest Rate Cash Flow Hedge Asset at Fair Value   81  
Interest Rate Cash Flow Hedge Liability at Fair Value $ (1,288)    
Derivative @ 2.366% 37.022M [Member]      
Derivative [Line Items]      
Derivative, Inception Date Jun. 02, 2017    
Derivative, Maturity Date Jun. 02, 2027    
Derivative, Notional Amount $ 36,592    
Derivative, Description of Variable Rate Basis 1 Month LIBOR with Floor    
Derivative, Fixed Interest Rate 2.366%    
Interest Rate Cash Flow Hedge Liability at Fair Value $ (3,856) $ (1,515)