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Derivative Financial Instruments (Impact of Cash Flow Hedges on Results of Operations, Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]                
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax $ (1,357) $ 8,722 $ 42,649 $ 11,379 $ 18,827 $ 11,555    
Amounts reclassified into earnings, net of taxes 2,126 $ 1,574 $ (323) (1,451) $ (1,817) $ (1,817)    
Interest Rate Swap [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax (1,357)     11,379     $ 50,014 $ 41,761
Amounts reclassified into earnings, net of taxes (2,126)     1,451     (3,377) 5,085
Cash Flow Hedging [Member] | Interest Expense [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Amounts reclassified into earnings, net of taxes 2,126 [1]     (1,451) [1]     3,377 (5,085)
Cash Flow Hedging [Member] | Interest Rate Swap [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax $ (1,357) [2]     $ (11,379) [2]     $ (50,014) $ (41,761)
[1] Amounts reclassified from AOCIL into earnings related to realized gains and losses on interest rate swaps are recognized when interest payments or receipts occur related to the swap contracts, which correspond to when interest payments are made on the Company’s hedged debt.
[2] In accordance with the derivatives and hedging guidance, the changes in fair values of interest rate swaps have been recorded in equity as a component of AOCIL. As the critical terms of the interest rate swaps match the underlying debt being hedged, all unrealized changes in fair value are recorded in AOCIL.