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LONG-TERM DEBT - Mandatorily Redeemable Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | May 01, 2019
Debt Instrument [Line Items] |  |  |  |  |  |
Preferred stock, shares issued (in shares) | 0 |  | 0 |  | 0 |
Preferred stock, par value (in dollars per share) | $ 0.001 |  | $ 0.001 |  | $ 0.001 |
Preferred stock issued | $ 0 |  | $ 0 |  | $ 0 |
Redeemable Preferred Stock |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  | 60,000
Preferred stock, par value (in dollars per share) |  |  |  |  |  | $ 0.001
Liquidation preference value | 60,000 |  | 60,000 |  |  | $ 60,000
Preferred stock issued |  |  |  |  |  | $ 60,000
Interest expense paid on dividends | $ 2,200 | $ 2,400 | $ 4,600 | $ 4,200 |  |

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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + Details
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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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