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Derivative Instruments (Effect of Derivatives on Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest expense, net | [1] | $ 29,463 | $ 30,361 | $ 35,227
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Loss recognized in other comprehensive income, net of tax |  | (14,632) | (19,824) | (3,062)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Interest Expense [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Loss reclassified from accumulated other comprehensive loss, net of tax1 | [2] | $ (7,451) | $ (1,384) | $ (647)
[1] | Includes amortization of bond discounts and deferred loan fees.
[2] | Realized gains and losses on interest rate contracts consist of net cash received or paid and interest accruals on the interest rate swaps during the periods. Net cash received or paid is included in the supplemental cash flow information within interest, net of amounts capitalized in the Consolidated Statements of Cash Flows.

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