Accumulated Other Comprehensive Income (Loss) (Summary Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 3,209,250	$ 3,239,354	$ 3,285,447	$ 1,886,107	$ 1,131,424	$ 1,132,487	$ 3,285,447	$ 1,132,487
Unrealized gain (loss) on available for sale debt securities of the Joint Venture				134	1,173			1,307
Change associated with foreign currency translation	11,526	5,221	6,353	1,728	1,583	226	23,100	3,537
Balance	3,233,738	3,209,250	3,239,354	1,950,131	1,886,107	1,131,424	3,233,738	1,950,131
Available For Sale Debt Security [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance				1,173
Unrealized gain (loss) on available for sale debt securities of the Joint Venture				134	1,173
Balance				1,307	1,173			1,307
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	4,490	(731)	(7,084)	244	(1,339)	(1,565)	(7,084)	(1,565)
Change associated with foreign currency translation	11,526	5,221	6,353	1,728	1,583	226
Balance	16,016	4,490	(731)	1,972	244	(1,339)	16,016	1,972
Cash Flow Hedge [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(6,468)	(4,472)	(288)	(8,010)	(6,700)	(1,691)	(288)	(1,691)
Change associated with current period hedging	(383)	(2,277)	(4,459)	289	(1,509)	(5,117)
Reclassification into earnings	302	281	275	1,024	199	(314)
Balance	(6,549)	(6,468)	(4,472)	(6,697)	(8,010)	(6,700)	(6,549)	(6,697)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(1,978)	(5,203)	(7,372)	(6,593)	(8,039)	(3,256)	(7,372)	(3,256)
Unrealized gain (loss) on available for sale debt securities of the Joint Venture				134	1,173
Change associated with foreign currency translation	11,526	5,221	6,353	1,728	1,583	226
Change associated with current period hedging	(383)	(2,277)	(4,459)	289	(1,509)	(5,117)
Reclassification into earnings	302	281	275	1,024	199	(314)
Balance	$ 9,467	$ (1,978)	$ (5,203)	$ (3,418)	$ (6,593)	(8,039)	$ 9,467	(3,418)
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2018-02 [Member] | Cash Flow Hedge [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance						422		422
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2018-02 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance						$ 422		$ 422