Equity (Balance of and Changes in Each Component of AOCI) (Footnote) (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended		12 Months Ended
		Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification				$ 0		$ (87)	$ (2,020)
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ (47,202)	$ (14,862)	$ 29,043	$ 22,656	$ (47,202)	29,043	$ 8,788	$ 2,619
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Derivative Instruments, Gain (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification							(2,573)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Derivative Instruments, Gain (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	[1]						0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Derivative Instruments, Gain (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification							$ 0

[1] Includes cash flow hedges of $(47,202) and $8,788 as of September 30, 2019 and December 31, 2018, respectively, and $29,043 and $2,619 as of September 30, 2018 and December 31, 2017, respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.