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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred Financing Costs (Details)	12 Months Ended
	Dec. 31, 2017
Senior Notes
Debt Instrument [Line Items]
Deferred financing cost, amortization period	8 years
Junior Subordinated Debt
Debt Instrument [Line Items]
Deferred financing cost, amortization period	5 years

X

- Definition

Deferred Financing Cost, Amortization Period

+ References

No definition available.

+ Details

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X

- 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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X

- Details

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X

- Details

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