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Schedule I - Parent Company Only - Summary of Revision of Consolidated Statements of cash flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:                          
Net income available to common stockholders $ (12,744) $ 9,904 $ 39,273 $ 20,169 $ (33,475) $ (1,553) $ 22,307 $ 84,974 $ 59,442 $ 69,346 $ 56,602 $ 72,253 $ 286,610
Adjustments to reconcile net income to net cash used in operating activities:                          
Equity in net gains (losses) of unconsolidated investments (1,354) (1,527) (1,119) (1,023) (1,064) (1,530) (738) (783)     (5,023) (4,115) (7,377)
Deferred tax (benefit) expense       2,686         2,622 6,798 (16,549) (4,196) (23,737)
(Decrease) increase in operating liabilities:                          
Accounts payable, accrued and other liabilities       (44,770)         (78,249) (39,488) 57,791 (17,878) 51,003
Net cash provided by (used in) operating activities                     304,263 239,062 (67,345)
CASH FLOWS FROM INVESTING ACTIVITIES:                          
Net cash provided by (used in) investing activities                     (77,592) (40,602) 9,236
CASH FLOWS FROM FINANCING ACTIVITIES:                          
Net cash provided by (used in) financing activities                     (13,101) 18,246 50,888
Net increase (decrease) in Cash and cash equivalents, and Cash segregated under regulatory requirements       21,248         50,886 100,419 214,563 219,336 (380,012)
Cash and cash equivalents, and Cash segregated under regulatory requirements at beginning of period 736,533 687,000 657,362 636,114       416,778 636,114 636,114 636,114 416,778 796,790
Cash and cash equivalents, and Cash segregated under regulatory requirements at end of period 850,677 736,533 687,000 657,362 636,114       687,000 736,533 850,677 636,114 416,778
As Reported [Member]                          
CASH FLOWS FROM OPERATING ACTIVITIES:                          
Net income available to common stockholders   24,930 39,559 21,032 (26,556) $ 2,560 $ 21,765 87,174 60,591 85,521   84,943 279,866
Adjustments to reconcile net income to net cash used in operating activities:                          
Deferred tax (benefit) expense       786         722 (1,202)   (1,803) (22,635)
(Decrease) increase in operating liabilities:                          
Accounts payable, accrued and other liabilities       (60,259)         (85,059) (48,880)   (34,840) 63,214
Net cash provided by (used in) operating activities                       239,062 (67,345)
CASH FLOWS FROM INVESTING ACTIVITIES:                          
Net cash provided by (used in) investing activities                       (40,602) 9,236
CASH FLOWS FROM FINANCING ACTIVITIES:                          
Net cash provided by (used in) financing activities                       18,246 50,888
Net increase (decrease) in Cash and cash equivalents, and Cash segregated under regulatory requirements       21,248         50,886 100,419   219,336 (380,012)
Cash and cash equivalents, and Cash segregated under regulatory requirements at beginning of period 736,533 687,000 657,362 636,114       416,778 636,114 636,114 636,114 416,778 796,790
Cash and cash equivalents, and Cash segregated under regulatory requirements at end of period   $ 736,533 $ 687,000 657,362 636,114       687,000 736,533   636,114 416,778
Adjustments [Member]                          
CASH FLOWS FROM OPERATING ACTIVITIES:                          
Net income available to common stockholders                       (12,690) 6,744
Adjustments to reconcile net income to net cash used in operating activities:                          
Deferred tax (benefit) expense                       (2,393) (1,102)
(Decrease) increase in operating liabilities:                          
Accounts payable, accrued and other liabilities                       16,962 (12,211)
Parent Company [Member]                          
CASH FLOWS FROM OPERATING ACTIVITIES:                          
Net income available to common stockholders                     48,908 47,562 202,196
Less: Equity income of discontinued operations                         (125,341)
Adjustments to reconcile net income to net cash used in operating activities:                          
Equity in net gains (losses) of unconsolidated investments                     (41,876) (50,413) (49,087)
Deferred tax (benefit) expense                     (13,585) (20,042) (12,449)
Decrease (increase) in operating assets:                          
Investments in subsidiaries                     (11,480) 12,400 (368,509)
(Decrease) increase in operating liabilities:                          
Accounts payable, accrued and other liabilities                     14,295 (4,125) 3,321
Net cash provided by (used in) operating activities                     (184,491) (361,018) (785,132)
CASH FLOWS FROM FINANCING ACTIVITIES:                          
Net cash provided by (used in) financing activities                     184,471 360,907 749,601
Net increase (decrease) in Cash and cash equivalents, and Cash segregated under regulatory requirements                     (20) (111) (44)
Cash and cash equivalents, and Cash segregated under regulatory requirements at beginning of period       44       155 44 44 44 155 199
Cash and cash equivalents, and Cash segregated under regulatory requirements at end of period $ 24       44           24 44 155
Parent Company [Member] | As Reported [Member]                          
CASH FLOWS FROM OPERATING ACTIVITIES:                          
Net income available to common stockholders                       55,707 197,520
Less: Equity income of discontinued operations                         (123,816)
Adjustments to reconcile net income to net cash used in operating activities:                          
Equity in net gains (losses) of unconsolidated investments                       (58,819) (49,472)
Deferred tax (benefit) expense                       (19,947)  
Decrease (increase) in operating assets:                          
Investments in subsidiaries                       12,399 (365,405)
(Decrease) increase in operating liabilities:                          
Accounts payable, accrued and other liabilities                       (3,958) 3,753
Net cash provided by (used in) operating activities                       (361,018) (785,132)
CASH FLOWS FROM FINANCING ACTIVITIES:                          
Net cash provided by (used in) financing activities                       360,907 749,601
Net increase (decrease) in Cash and cash equivalents, and Cash segregated under regulatory requirements                       (111) (44)
Cash and cash equivalents, and Cash segregated under regulatory requirements at beginning of period       $ 44       $ 155 $ 44 $ 44 $ 44 155 199
Cash and cash equivalents, and Cash segregated under regulatory requirements at end of period         $ 44             44 155
Parent Company [Member] | Adjustments [Member]                          
CASH FLOWS FROM OPERATING ACTIVITIES:                          
Net income available to common stockholders                       (8,145) 4,676
Less: Equity income of discontinued operations                         (1,525)
Adjustments to reconcile net income to net cash used in operating activities:                          
Equity in net gains (losses) of unconsolidated investments                       8,406 385
Deferred tax (benefit) expense                       (95)  
Decrease (increase) in operating assets:                          
Investments in subsidiaries                       1 (3,104)
(Decrease) increase in operating liabilities:                          
Accounts payable, accrued and other liabilities                       $ (167) $ (432)