Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Financial assets that are measured at fair value on a recurring basis
Marketable equity securities			$ 2,092
Contingent consideration	$ (3,440)	$ (3,758)	(19,719)
Net financial assets (liabilities)	4,374	(2,606)	(15,675)
Level 1 [Member]
Financial assets that are measured at fair value on a recurring basis
Marketable equity securities			2,092
Contingent consideration	0	0	0
Net financial assets (liabilities)	0	0	2,092
Level 2 [Member]
Financial assets that are measured at fair value on a recurring basis
Marketable equity securities			0
Contingent consideration	0	0	0
Net financial assets (liabilities)	7,814	1,152	1,952
Level 3 [Member]
Financial assets that are measured at fair value on a recurring basis
Marketable equity securities			0
Contingent consideration	(3,440)	(3,758)	(19,719)
Net financial assets (liabilities)	(3,440)	(3,758)	(19,719)
Foreign currency forward [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	7,814	1,152	1,952
Foreign currency forward [Member] | Level 1 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	0	0	0
Foreign currency forward [Member] | Level 2 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	7,814	1,152	1,952
Foreign currency forward [Member] | Level 3 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	0	0	$ 0
Convertible notes hedges [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	45,163	36,994
Convertible notes hedges [Member] | Level 1 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	0	0
Convertible notes hedges [Member] | Level 2 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	45,163	36,994
Convertible notes hedges [Member] | Level 3 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative assets	0	0
Convertible notes embedded derivative [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative liability	(45,163)	(36,994)
Convertible notes embedded derivative [Member] | Level 1 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative liability	0	0
Convertible notes embedded derivative [Member] | Level 2 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative liability	(45,163)	(36,994)
Convertible notes embedded derivative [Member] | Level 3 [Member]
Financial assets that are measured at fair value on a recurring basis
Derivative liability	$ 0	$ 0