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DEBT (Senior Unsecured Revolving Credit Facility) (Narrative) (Details) - Unsecured Senior Revolving Credit Facility [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |
Credit facility capacity | $ 750,000,000 |
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate in excess of LIBOR | 0.75% |
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate in excess of LIBOR | 1.63% |
LIBOR [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate in excess of LIBOR | 1.125% | 1.125%
Letter of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility capacity | $ 150,000,000 |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition 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. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |