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Summary of Significant Accounting Policies (Summary of Changes in Accumulated Balances of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 351
Other comprehensive loss before reclassifications adjustments for gains (losses) on available for sale investments, tax	(237)
Amount of (loss) gain reclassified from accumulated other comprehensive loss, tax	(351)
Net current period other comprehensive income (loss), tax	(588)
Ending Balance	(237)
Beginning Balance	(239,279)
Other comprehensive loss before reclassifications adjustments for gains (losses) on available for sale investments, net of tax	(10,743)
Amount of (loss) gain reclassified from accumulated other comprehensive loss, net of tax	672	$ 379
Net current period other comprehensive income (loss), net of tax	(10,071)
Ending Balance	(249,350)
Unrealized (Losses) Gains on Investments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(1,023)
Other comprehensive loss before reclassifications adjustments for gains (losses) on available for sale investments, before tax	685
Amount of (loss) gain reclassified from accumulated other comprehensive loss, before tax	1,023
Net current period other comprehensive income (loss), before tax	1,708
Ending Balance	685
Foreign Currency Translation [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(238,607)
Other comprehensive loss before reclassifications adjustments for gains (losses) on available for sale investments, before tax	(11,191)
Net current period other comprehensive income (loss), before tax	(11,191)
Ending Balance	$ (249,798)

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Amount before tax of increase (decrease) in accumulated in equity from transactions and other events and circumstances from non-owner sources. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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