Derivatives (Effect in the Consolidated Statements of Operations and Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Derivative financial instruments on consolidated statements of operations
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income		$ 11,973	$ (27,776)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings	[1]	(2,338)	(1,314)
Derivatives Designated in Hedging Relationships | Interest rate swaps | Earnings from equity method investments
Derivative financial instruments on consolidated statements of operations
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income		8,656	(15,172)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings		(234)	(226)
Derivatives Designated in Hedging Relationships | Interest rate swaps | Interest expense
Derivative financial instruments on consolidated statements of operations
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income		3,317	(12,604)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings		$ (2,104)	$ (1,088)

[1] Amounts reclassified to "Interest expense" in the Company's consolidated statements of operations for the three months ended March 31, 2021 and 2020 are $2,104 and $1,088, respectively. Amounts reclassified to "Earnings (losses) from equity method investments" in the Company's consolidated statements of operations for the three months ended March 31, 2021 and 2020 are $234 and $226, respectively.