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DEBT - 2017 Convertible, Term Loan Facility, and Margin Loan - Narrative (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 03, 2017 USD ($) shares | Feb. 17, 2017 USD ($) shares $ / shares | Feb. 13, 2017 $ / shares | Dec. 31, 2020 USD ($) | Aug. 31, 2019 USD ($) | Oct. 31, 2018 | Mar. 31, 2019 $ / shares | Dec. 31, 2020 USD ($) extensionOption | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 shares | Jul. 31, 2018 USD ($) | Mar. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash collateral |  |  |  | $ 163,181,000 |  |  |  | $ 163,181,000 |  | $ 188,289,000 |  |  |
Margin loan facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash collateral |  |  |  | 0 |  |  |  | 0 |  | 10,000,000 |  |  |
Convertible Debt | 2017 Convertible Bonds |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  | $ 402,500,000 |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  | 2.75% |  |  |  |  |  |  |  |  |  |  |
Debt instrument conversion ratio |  | 0.0265308 |  |  |  |  | 26.993 |  |  |  |  |  |
Debt instrument conversion price (in dollars per share) | $ / shares |  | $ 37.69 |  |  |  |  | $ 37.05 |  |  |  |  |  |
Debt instrument threshold percentage of stock price trigger |  | 35.00% |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  | $ 27.92 |  |  |  |  |  |  |  |  |  |
Derivative, cost of hedge |  | $ 31,200,000 |  |  |  |  |  |  |  |  |  |  |
Number of shares issued if converted | shares |  | 10,678,647 |  |  |  |  |  |  |  |  |  |  |
Debt instrument capped call strike price (in usd per share) | $ / shares |  | $ 37.69 |  |  |  |  |  |  |  |  |  |  |
Cap price premium | $ / shares |  | $ 48.86 |  |  |  |  |  |  |  |  |  |  |
Capped price threshold |  |  | 75.00% |  |  |  |  |  |  |  |  |  |
Debt instrument all-in cost percent |  | 4.30% |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible bonds |  | $ 360,200,000 |  |  |  |  |  |  |  |  |  |  |
Convertible debt |  | 320,300,000 |  |  |  |  |  |  |  |  |  |  |
Convertible, carrying amount of equity component |  | $ 39,900,000 |  |  |  |  |  |  |  |  |  |  |
Distribution (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.150 |  |  |  |  |  |
Credit Facility | Term Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 100,000,000.0 | $ 150,000,000 |  |  | $ 100,000,000.0 |  | $ 0 |  |  |
Maturity period of debt |  |  |  | 366 days | 15 months |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 5.00% |  |  |  |  |  |  |  |  |
Repayments of lines of credit |  |  |  | $ 50,000,000.0 |  |  |  |  |  |  |  |  |
Credit Facility | Term Facility | Extended Maturity |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity period of debt |  |  |  |  |  |  |  | 366 days |  |  |  |  |
Number of loan extension options | extensionOption |  |  |  |  |  |  |  | 2 |  |  |  |  |
Credit Facility | Margin loan facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 110,000,000.0 |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity period of debt |  |  |  |  |  | 5 years |  | 5 years |  |  |  |  |
Secured Debt | Margin loan facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.75%
Maturity period of debt | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Proceeds of new margin loan facility (up to) | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Common units, pledged as collateral | shares | 20,852,291 |  |  |  |  |  |  |  |  |  | 21,226,586 |  |
Facility remaining until maturity |  |  |  |  |  |  |  |  | $ 30,000,000.0 |  |  | $ 100,000,000.0 |
LIBOR | Credit Facility | Margin loan facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 2.75% |  |  |  |  |  |  |  |
LIBOR | Secured Debt | Margin loan facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.95% |  |  |  |  |  |  | 2.95% |  |  |  |  |
Minimum | LIBOR | Credit Facility | Term Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.50% |  |  |  |  |  |  |  |
Maximum | LIBOR | Credit Facility | Term Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 2.75% |  |  |  |  |  |  |  |

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