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Derivative Instruments (Hedges of Net Investments in Foreign Operations) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Currency Swap [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Gains Losses Deferred In Accumulated Other Comprehensive Income Loss On Derivatives | [1],[2] | $ (10,234) | $ 96,019 | $ 51,894
[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.

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- Definition The current period gain (loss) recognized in other comprehensive income related to the derivatives designated in cash flow hedges. + References No definition available. + Details
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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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- Details
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