Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income, Other Expenses, and Change in Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other comprehensive loss:
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance				$ (75,031)	$ (8,660)	$ 20,314
Foreign currency translation adjustments				(99,641)	(66,424)	(29,900)
Market value adjustments for securities				(245)	53	926
Total Other comprehensive (loss) income				(99,886)	(66,371)	(28,974)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ (174,917)			(174,917)	(75,031)	(8,660)
Other Expense (Income), Net:
Foreign currency transaction losses (gains), net				70,851	58,316	36,201
Debt extinguishment expense, net	25,112	$ 2,156	$ 5,544	27,305	16,495	43,724
Other, net				434	(9,624)	(4,723)
Other (Income) Expense, Net				98,590	65,187	75,202
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Other comprehensive loss:
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance				(76,010)	(9,586)	20,314
Foreign currency translation adjustments				(99,641)	(66,424)	(29,900)
Market value adjustments for securities				0	0	0
Total Other comprehensive (loss) income				(99,641)	(66,424)	(29,900)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(175,651)			(175,651)	(76,010)	(9,586)
Market value adjustments for securities
Other comprehensive loss:
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance				979	926	0
Foreign currency translation adjustments				0	0	0
Market value adjustments for securities				(245)	53	926
Total Other comprehensive (loss) income				(245)	53	926
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ 734			$ 734	$ 979	$ 926