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DEBT - Convertible Bonds Narrative (Details) |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 17, 2017 USD ($) shares $ / shares | Feb. 13, 2017 $ / shares | Sep. 30, 2018 $ / shares | Jun. 30, 2018 $ / shares | Dec. 31, 2018 shares | Jul. 31, 2018 USD ($) | Dec. 31, 2017 shares | Mar. 03, 2017 USD ($) shares | Mar. 31, 2012
Convertible Debt | Convertible Bonds |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  |  |  |  |  | 3.75%
Convertible Debt | 2017 Convertible Bonds |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount | $ 402,500,000.0 |  |  |  |  |  |  |  |
Maturity period of debt | 5 years |  |  |  |  |  |  |  |
Coupon rate | 2.75% |  |  |  |  |  |  |  |
Debt instrument conversion ratio | 0.0265308 |  | 0.0266375 | 0.0266102 |  |  |  |  |
Debt instrument conversion price (in dollars per share) | $ / shares | $ 37.69 |  | $ 37.54 | $ 37.58 |  |  |  |  |
Debt instrument threshold percentage of stock price trigger | 35.00% |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 27.92 |  |  |  |  |  |  |
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 |  |  | $ 0.15 | $ 0.125 |  |  |  |  |
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% |  |  |  |  |  |  |  |
Secured Debt | Margin Loan Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maturity period of debt |  |  |  |  | 3 years |  |  |  |
Proceeds of new margin loan facility (up to) |  |  |  |  |  |  |  | $ 150,000,000 |
Common units, pledged as collateral | shares |  |  |  |  | 21,226,586 |  | 20,852,291 | 20,852,291 |
Facility remaining until maturity |  |  |  |  |  | $ 100,000,000 |  |  |
LIBOR | Secured Debt | Margin Loan Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 3.95% |  |  |  |

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