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DEBT - Convertible Bonds Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended
	Feb. 17, 2017	Mar. 31, 2012	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term Debt and Due to Related Parties, Maturities, Repayments of Principal in Next Twelve Months			$ 674,257
Book value of vessels secured against long-term loans			$ 2,106,062	$ 2,543,012
Declared dividend per share (in dollars per share)			$ 0.20	$ 1.40
Long-term Debt and Due to Related Parties, Gross			$ 1,798,361	$ 1,878,061
Convertible Bonds | Equity Method Investments
Debt Instrument [Line Items]
Book value of vessels secured against long-term loans			13,000
Convertible Debt | Convertible Bonds
Debt Instrument [Line Items]
Long-term Debt and Due to Related Parties, Maturities, Repayments of Principal in Next Twelve Months			$ 219,700
Proceeds from issuance of convertible bonds		$ 250,000
Convertible Debt		221,900
Carrying amount of equity component		$ 25,000
Coupon rate		3.75%
Debt instrument conversion price (in dollars per share)		$ 55	$ 45.37	$ 45.82
Debt Instrument, Repurchase Amount			$ 30,300
Long-term Debt and Due to Related Parties, Gross			$ 218,851	$ 243,369
Subsequent Event | Convertible Bonds
Debt Instrument [Line Items]
Proceeds from issuance of convertible bonds	$ 360,200
Subsequent Event | Convertible Debt | Convertible Bonds
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 402,500

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Long-term Debt and Due to Related Parties, Maturities, Repayments of Principal in Next Twelve Months

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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The price per share of the conversion feature embedded in the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value amount of debt instrument that was repurchased.

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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