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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of revenues from contracts with customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | $ 309,519 | $ 283,896 | $ 618,368 | $ 577,032
Total revenues | 148,365 | 406,278 | 491,397 | 838,368
All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 32,987 | 14,710 | 59,661 |
Total revenues | 32,987 | 14,710 | 59,661 |
Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 48,478 | 39,931 | 105,955 | 88,963
Total revenues | (114,646) | 162,052 | (24,823) | 347,463
Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 48,903 | 47,455 | 98,848 | 94,694
Total revenues | 50,873 | 47,716 | 102,655 | 97,530
Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 11,985 | 10,561 | 17,765 | 16,221
Total revenues | 11,985 | 10,561 | 17,765 | 16,221
Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 36,533 | 31,212 | 71,618 | 56,222
Total revenues | 36,533 | 31,212 | 71,618 | 56,222
Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 79,209 | 84,956 | 161,575 | 171,875
Total revenues | 79,209 | 84,956 | 161,575 | 171,875
Communications Segment | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues | 32,987 | 14,710 | 59,661 | 28,292
Consumer Products Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 51,424 | 55,071 | 102,946 | 120,765
Total revenues | 51,424 | 55,071 | 102,946 | 120,765
All Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  |  | 28,292
Total revenues |  |  |  | 28,292
Corporate finance, consulting and investment banking fees |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 64,118 | 49,871 | 137,265 | 103,536
Corporate finance, consulting and investment banking fees | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 |  |
Corporate finance, consulting and investment banking fees | Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 40,082 | 30,727 | 90,245 | 69,877
Corporate finance, consulting and investment banking fees | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Corporate finance, consulting and investment banking fees | Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Corporate finance, consulting and investment banking fees | Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 24,036 | 19,144 | 47,020 | 33,659
Corporate finance, consulting and investment banking fees | Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Corporate finance, consulting and investment banking fees | Consumer Products Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Corporate finance, consulting and investment banking fees | All Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  | 0 | 0
Wealth and asset management fees |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 47,540 | 45,707 | 94,655 | 89,681
Wealth and asset management fees | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 |  |
Wealth and asset management fees | Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 1,368 | 1,258 | 2,425 | 1,922
Wealth and asset management fees | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 46,172 | 44,449 | 92,230 | 87,759
Wealth and asset management fees | Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Wealth and asset management fees | Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Wealth and asset management fees | Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Wealth and asset management fees | Consumer Products Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Wealth and asset management fees | All Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  | 0 | 0
Commissions, fees and reimbursed expenses |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 25,877 | 31,905 | 50,702 | 60,991
Commissions, fees and reimbursed expenses | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 |  |
Commissions, fees and reimbursed expenses | Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 7,028 | 7,946 | 13,285 | 17,164
Commissions, fees and reimbursed expenses | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 2,731 | 3,006 | 6,618 | 6,935
Commissions, fees and reimbursed expenses | Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 3,621 | 8,885 | 6,201 | 14,329
Commissions, fees and reimbursed expenses | Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 12,497 | 12,068 | 24,598 | 22,563
Commissions, fees and reimbursed expenses | Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Commissions, fees and reimbursed expenses | Consumer Products Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Commissions, fees and reimbursed expenses | All Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  | 0 | 0
Subscription services |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 76,389 | 82,183 | 156,126 | 165,190
Subscription services | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 |  |
Subscription services | Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Subscription services | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Subscription services | Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Subscription services | Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Subscription services | Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 76,389 | 82,183 | 156,126 | 165,190
Subscription services | Consumer Products Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Subscription services | All Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  | 0 | 0
Service contract revenues |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  | 980 |
Service contract revenues | Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  | 0 |
Service contract revenues | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  | 0 |
Service contract revenues | Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  | 980 |
Service contract revenues | Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  | 0 |
Service contract revenues | Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  | 0 |
Service contract revenues | Consumer Products Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  | 0 |
Service contract revenues | All Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  | 0 |
Sale of goods |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 63,937 | 58,387 | 119,590 | 126,164
Total revenues | 63,937 | 58,387 | 119,590 | 126,164
Sale of goods | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 2,684 | 0 | 3,299 |
Sale of goods | Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Sale of goods | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Sale of goods | Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 8,364 | 1,676 | 10,584 | 1,892
Sale of goods | Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Sale of goods | Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 1,465 | 1,640 | 2,761 | 3,507
Sale of goods | Consumer Products Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 51,424 | 55,071 | 102,946 | 120,765
Sale of goods | All Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  |  | 0
Advertising, licensing and other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 31,658 | 15,843 | 59,050 | 31,470
Advertising, licensing and other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 30,303 | 14,710 | 56,362 |
Advertising, licensing and other | Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Advertising, licensing and other | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Advertising, licensing and other | Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Advertising, licensing and other | Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Advertising, licensing and other | Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 1,355 | 1,133 | 2,688 | 3,178
Advertising, licensing and other | Consumer Products Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers | 0 | 0 | 0 | 0
Advertising, licensing and other | All Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Total revenues from contracts with customers |  |  |  | 28,292
Trading (loss) income |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | (31,321) | 33,158 | (48,988) | 41,450
Total revenues | (31,321) | 33,158 | (48,988) | 41,450
Trading (loss) income | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 |
Trading (loss) income | Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | (32,612) | 32,685 | (50,879) | 39,705
Total revenues | (32,612) | 32,685 | (50,879) | 39,705
Trading (loss) income | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 1,291 | 473 | 1,891 | 1,745
Total revenues | 1,291 | 473 | 1,891 | 1,745
Trading (loss) income | Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Trading (loss) income | Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Trading (loss) income | Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Trading (loss) income | Consumer Products Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Trading (loss) income | All Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer |  |  |  | 0
Fair value adjustments on loans |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | (175,582) | 9,207 | (187,783) | 52,483
Total revenues | (175,582) | 9,207 | (187,783) | 52,483
Fair value adjustments on loans | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 |
Fair value adjustments on loans | Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | (175,582) | 9,207 | (187,783) | 52,483
Total revenues | (175,582) | 9,207 | (187,783) | 52,483
Fair value adjustments on loans | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Fair value adjustments on loans | Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Fair value adjustments on loans | Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Fair value adjustments on loans | Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Fair value adjustments on loans | Consumer Products Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Fair value adjustments on loans | All Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer |  |  |  | 0
Interest income - loans |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 18,508 | 35,126 | 40,643 | 75,138
Total revenues | 18,508 | 35,126 | 40,643 | 75,138
Interest income - loans | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 |
Interest income - loans | Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 18,508 | 35,126 | 40,643 | 75,138
Total revenues | 18,508 | 35,126 | 40,643 | 75,138
Interest income - loans | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Interest income - loans | Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Interest income - loans | Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Interest income - loans | Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Interest income - loans | Consumer Products Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Interest income - loans | All Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer |  |  |  | 0
Interest income - securities lending |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 24,798 | 40,073 | 62,607 | 77,247
Total revenues | 24,798 | 40,073 | 62,607 | 77,247
Interest income - securities lending | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 |
Interest income - securities lending | Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 24,798 | 40,073 | 62,607 | 77,247
Total revenues | 24,798 | 40,073 | 62,607 | 77,247
Interest income - securities lending | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Interest income - securities lending | Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Interest income - securities lending | Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Interest income - securities lending | Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Interest income - securities lending | Consumer Products Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Interest income - securities lending | All Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer |  |  |  | 0
Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 2,443 | 4,818 | 6,550 | 15,018
Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 |
Other | Capital Markets Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 1,764 | 5,030 | 4,634 | 13,927
Other | Wealth Management Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 679 | (212) | 1,916 | 1,091
Other | Auction and Liquidation Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Other | Financial Consulting Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 |  | 0 | 0
Other | Communications Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | 0 | 0 | 0 | 0
Other | Consumer Products Segment | Operating Segments |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer | $ 0 | $ 0 | $ 0 | 0
Other | All Other | All Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenue not from contract with customer |  |  |  | $ 0

X
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Data Type: | xbrli:stringItemType
Balance Type: | na
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