Significant Accounting Policies (Details 5) $ in Thousands	6 Months Ended
Jun. 30, 2015 USD ($)
Changes in accumulated other comprehensive income (loss)
Beginning Balance	$ 5,951,734
Ending Balance	5,386,487
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss)
Beginning Balance	(71,428)
Other comprehensive (loss) before reclassifications	(141,538)
Amounts reclassified from accumulated other comprehensive income (loss)	(74,909)
Net current-period other comprehensive income (loss)	(216,447)
Ending Balance	(287,875)
Currency translation adjustments
Changes in accumulated other comprehensive income (loss)
Beginning Balance	(129,554)
Other comprehensive (loss) before reclassifications	(138,793)
Net current-period other comprehensive income (loss)	(138,793)
Ending Balance	(268,347)
Accumulated derivative losses, net
Changes in accumulated other comprehensive income (loss)
Beginning Balance	(45,824)
Other comprehensive (loss) before reclassifications	19,339
Amounts reclassified from accumulated other comprehensive income (loss)	5,278
Net current-period other comprehensive income (loss)	24,617
Ending Balance	(21,207)
Net gain (loss) on marketable securities
Changes in accumulated other comprehensive income (loss)
Beginning Balance	103,950
Other comprehensive (loss) before reclassifications	(22,084)
Amounts reclassified from accumulated other comprehensive income (loss)	(80,187)
Net current-period other comprehensive income (loss)	(102,271)
Ending Balance	$ 1,679

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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