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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 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]      
Changes in fair value of cash flow hedges, net of taxes $ 18,827 [1] $ 11,555 $ 30,382 [1]
Amounts reclassified into earnings, net of taxes (1,817) [2],[3] $ (1,817) (3,634) [2],[3]
Interest Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amounts reclassified into earnings, net of taxes [2],[3] (1,817)   (3,634)
Interest Rate Swap [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Changes in fair value of cash flow hedges, net of taxes [1] $ 18,827   $ 30,382
[1] In accordance with the derivatives and hedging guidance, the changes in fair values of interest rate swaps and fuel hedges 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. Because changes in the actual price of diesel fuel and changes in the DOE index price did not offset exactly each reporting period, the Company assessed whether the fuel hedges were highly effective using the cumulative dollar offset approach.
[2] 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.
[3] Amounts reclassified from AOCIL into earnings related to realized gains and losses on the fuel hedges are recognized when settlement payments or receipts occur related to the hedge contracts, which correspond to when the underlying fuel is consumed.