Net Income (Loss) Per Share (Computation of Basic Net Income (Loss) Per Share of Common Stock) (Details) - USD ($) $ / shares in Units, $ 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
Earnings Per Share [Line Items]
Net income (loss)	$ 2,196	$ (42,622)	$ (58,694)	$ 50,735	$ (93,935)	$ (37,517)	$ (99,120)	$ (80,716)
Weighted average common shares outstanding	304,547,891			124,962,970			304,104,388	108,371,642
Minimum shares issuable under purchase contracts	16,465,704			18,429,325			16,465,704	12,286,217
Total weighted average shares outstanding	321,013,595			143,392,295			320,570,092	120,657,859
Basic net income (loss) per share	$ 0.01			$ 0.35			$ (0.31)	$ (0.67)
Diluted net income per share:
Net income (loss)	$ 2,196	$ (42,622)	$ (58,694)	$ 50,735	$ (93,935)	$ (37,517)	$ (99,120)	$ (80,716)
Number of shares used in basic computation	321,013,595			143,392,295			320,570,092	120,657,859
Weighted average effect of dilutive securities	324,815,524			146,201,860			320,570,092	120,657,859
Diluted net income (loss) per share	$ 0.01			$ 0.35			$ (0.31)	$ (0.67)
Dilutive Shares Issuable Under Purchase Contracts [Member]
Diluted net income per share:
Weighted average effect of dilutive securities				1,450,910
Time-Vesting Options [Member]
Diluted net income per share:
Weighted average effect of dilutive securities	932,344			1,059,868
Restricted Stock Units [Member]
Diluted net income per share:
Weighted average effect of dilutive securities	2,753,810			289,537
Deferred Stock Units [Member]
Diluted net income per share:
Weighted average effect of dilutive securities	95,624			9,250
Employee Stock Purchase Program Shares [Member]
Diluted net income per share:
Weighted average effect of dilutive securities	20,151