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Derivative Instruments (Hedges of Net Investments in Foreign Operations) (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2018

Mar. 31, 2017

Currency Swap [Member]

Derivatives, Fair Value [Line Items]

Net Derivatives Gains (Losses) Deferred in AOCI

^[1],[2]

$ 8,805

$ (7,606)

Foreign Exchange Forward [Member]

Derivatives, Fair Value [Line Items]

Net Derivatives Gains (Losses) Deferred in AOCI

^[1],[2]

$ 12,236

$ 0

[1]	There was no ineffectiveness recognized for the Company’s hedges of net investments in foreign operations.
[2]	There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented.

X

- Definition

The current period gain (loss) recognized in other comprehensive income related to the effective portion of derivatives designated in cash flow hedges.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: