Consolidated Statements Of Stockholders' Equity - USD ($)	Total	Affiliated Entity [Member]	Common Stock [Member]	Common Stock [Member] Affiliated Entity [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member] Affiliated Entity [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Affiliated Entity [Member]
Balance at Dec. 31, 2016	$ 577,385,000		$ 3,022,000		$ 851,315,000		$ (7,558,000)	$ (269,394,000)
Balance, shares at Dec. 31, 2016			302,225,923
Comprehensive income (loss):
Net income (loss)	7,983,000							7,983,000
Other comprehensive income:
Unrealized losses on securities, net of tax	4,819,000						4,819,000
Foreign currency translation adjustments, net of tax of ($288), $0, and $0, respectively	23,028,000						23,028,000
Other comprehensive (loss) income, net of tax:	27,847,000						27,847,000
Allocated Share-based Compensation Expense	0
Payment Of Dividends- Related Party	0
Repayments of Related Party Debt	0
Payments of Dividends	0
Balance at Dec. 31, 2017	$ 613,215,000		$ 3,022,000		851,315,000		20,289,000	(261,411,000)
Balance, shares at Dec. 31, 2017	38,097,525		302,225,923
Comprehensive income (loss):
Net income (loss)	$ 854,219,000							854,219,000
Other comprehensive income:
Unrealized losses on securities, net of tax	(6,866,000)						(6,866,000)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(832,000)						(832,000)
Foreign currency translation adjustments, net of tax of ($288), $0, and $0, respectively	(18,391,000)						(18,391,000)
Other comprehensive (loss) income, net of tax:	(26,089,000)						(26,089,000)
Stock Repurchased and Retired During Period, Shares			(11,688,311)
Stock Repurchased and Retired During Period, Value	$ (225,000,000)		$ (117,000)		(32,844,000)			(192,039,000)
Granted	979,790
Allocated Share-based Compensation Expense	$ 1,151,000				1,151,000
Payment Of Dividends- Related Party	(1,488,649,000)							(1,488,649,000)
Repayments of Related Party Debt	(750,000,000)
Payments of Dividends	(55,616,000)							(55,616,000)
Balance at Dec. 31, 2018	(1,076,769,000)		$ 2,905,000		819,622,000		(5,800,000)	(1,893,496,000)
Balance, shares at Dec. 31, 2018			290,537,612
Other comprehensive income:
Repayment of Notes Receivable from Related Parties	(750,000,000)
Net income (loss)	744,602,000
Unrealized losses on securities, net of tax	11,830,000						11,830,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(7,020,000)						(7,020,000)
Foreign currency translation adjustments, net of tax of ($288), $0, and $0, respectively	(6,371,000)
Other comprehensive (loss) income, net of tax:	(1,561,000)						(1,561,000)
Stock Repurchased and Retired During Period, Shares			(1,004,685)	(19,047,619)
Stock Repurchased and Retired During Period, Value	$ (10,868,000)	$ (250,000,000)	$ (10,000)	$ (190,000)	(2,825,000)	$ (53,524,000)		(8,033,000)	$ (196,286,000)
Granted	229,250
Allocated Share-based Compensation Expense	$ 2,146,000				2,146,000			0
Payment Of Dividends- Related Party	(78,010,000)							(78,010,000)
Repayments of Related Party Debt	0
Payments of Dividends	(20,613,000)							(20,613,000)
Balance at Dec. 31, 2019	$ (691,073,000)		$ 2,705,000		$ 765,419,000		$ (7,361,000)	$ (1,451,836,000)
Balance, shares at Dec. 31, 2019			270,485,308