Other Comprehensive Income and Accumulated Other Comprehensive Income (Significant Reclassifications from AOCI) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net product sales		$ 798,524	$ 665,791	$ 2,251,495	$ 1,902,107
Foreign currency (loss) gain		(1,011)	2,795	(3,740)	1,755
Interest expense		(24,807)	(19,971)	(72,490)	(24,593)
Investment income		4,626	1,967	8,049	7,077
Income before income taxes		158,114	139,359	471,677	423,596
Income tax provision		(63,776)	(323,116)	(165,113)	(345,815)
Net income (loss)		94,338	(183,757)	306,564	77,781
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net product sales		12,769	29,534	51,254	90,240
Foreign currency (loss) gain		0	(375)	0	1,146
Interest expense		(344)	0	(344)	0
Income before income taxes		12,425	29,159	50,910	91,386
Income tax provision		(4,406)	(3,645)	(17,974)	(11,424)
Net income (loss)		8,019	25,514	32,936	79,962
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Investment income		647	0	536	35
Income before income taxes		647	0	536	35
Income tax provision		(237)	0	(196)	(12)
Net income (loss)		410	0	340	23
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service costs and actuarial losses	[1]	(117)	(313)	(346)	(939)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	[1]	0	821	0	821
Income before income taxes		(117)	508	(346)	(118)
Income tax provision		42	(107)	124	25
Net income (loss)		$ (75)	$ 401	$ (222)	$ (93)

[1] This AOCI component is included in the computation of net periodic pension benefit cost (see Note 15 for additional details).