Derivative Instruments (Hedges of Net Investments in Foreign Operations) (Details) (Currency Swap [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Net Derivatives Gains (Losses) Deferred in AOCI	$ 23,080	[1],[2]	$ 10,922	[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.