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Financial Instruments - Derivatives and Hedging (Cash Flow Hedging Relationship) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Change in unrealized gain (loss) on interest rate swaps	$ (26,998)	$ (19,333)	$ 3,837
Amortization (accretion) of interest rate swaps to interest expense	8,427	(6,380)	(12,198)
Change in unrealized loss on interest rate swaps, net	$ (18,571)	$ (25,713)	$ (8,361)

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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