Other Comprehensive Income (Loss) and Related Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Other comprehensive income, tax (expense) benefit
Tax effects on foreign currency translation adjustments			$ 0
Tax effects on unrealized gains or losses on available-for-sale securities			0
Cumulative foreign currency translation losses	$ 117,600		117,600		$ 63,800
Reclassifications out of accumulated other comprehensive loss
Recognition of realized (gains) losses on available-for-sale securities in net income	(9)	$ 27	(29)	$ (7)
Recognition of other-than-temporary loss on available-for-sale securities in net income	1,243		5,892
Recognition of foreign currency translation losses in net income			1,889
Total reclassifications, net of tax and noncontrolling interests	1,234	27	7,752	(7)
Gains (losses) on marketable investment securities, net
Reclassifications out of accumulated other comprehensive loss
Recognition of realized (gains) losses on available-for-sale securities in net income	(9)	$ 27	(29)	$ (7)
Other-than-temporary impairment on available-for-sale securities
Reclassifications out of accumulated other comprehensive loss
Recognition of other-than-temporary loss on available-for-sale securities in net income	$ 1,243		5,892
Other, net
Reclassifications out of accumulated other comprehensive loss
Recognition of foreign currency translation losses in net income			$ 1,889