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Derivative Instruments (Details 4) (Foreign Currency Swaps, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Foreign Currency Swaps
        
Net Investments in Foreign Operations [Line Items]        
Net Derivatives Gains (Losses) Deferred in AOCI $ 23,913 [1],[2] $ 6,642 [1],[2] $ 34,835 [1],[2] $ (4,003) [1],[2]
[1] 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.
[2] There was no ineffectiveness recognized for the Company’s hedges of net investments in foreign operations.