Debt (Components Of Total Indebtedness) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member]	Dec. 31, 2013 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member]	Sep. 30, 2014 7.00% Senior Notes Due 2019 [Member]	May 06, 2014 7.00% Senior Notes Due 2019 [Member]	Dec. 31, 2013 7.00% Senior Notes Due 2019 [Member]	Sep. 30, 2014 7.00% Senior Notes Due 2020 [Member]	Dec. 31, 2013 7.00% Senior Notes Due 2020 [Member]	Sep. 30, 2014 7.25% Senior Notes Due 2022 [Member]	Dec. 31, 2013 7.25% Senior Notes Due 2022 [Member]	Sep. 30, 2014 5.75% Senior Notes Due 2022 [Member]	Dec. 31, 2013 5.75% Senior Notes Due 2022 [Member]	Sep. 30, 2014 5.735% Senior Notes Due 2023 [Member]	Jun. 30, 2014 5.735% Senior Notes Due 2023 [Member]	Dec. 31, 2013 5.735% Senior Notes Due 2023 [Member]	Sep. 30, 2014 3.25% AMS Convertible Notes Due 2036 [Member]	Dec. 31, 2013 3.25% AMS Convertible Notes Due 2036 [Member]	Sep. 30, 2014 4.00% AMS Convertible Notes Due 2041 [Member]	Dec. 31, 2013 4.00% AMS Convertible Notes Due 2041 [Member]	Sep. 30, 2014 Term Loan A Facility Due 2019 [Member]	Feb. 28, 2014 Term Loan A Facility Due 2019 [Member]	Dec. 31, 2013 Term Loan A Facility Due 2019 [Member]	Sep. 30, 2014 Term Loan B Facility Due 2021 [Member]	Feb. 28, 2014 Term Loan B Facility Due 2021 [Member]	Dec. 31, 2013 Term Loan B Facility Due 2021 [Member]	Sep. 30, 2014 Term Loan A Facility Due 2018 [Member]	Dec. 31, 2013 Term Loan A Facility Due 2018 [Member]	Sep. 30, 2014 Term Loan B Facility Due 2018 [Member]	Dec. 31, 2013 Term Loan B Facility Due 2018 [Member]
Debt Instrument [Line Items]
Convertible Note Gross			$ 98,818,000	$ 379,500,000
Unamortized discount			(2,684,000)	(34,079,000)
Net carrying amount of the debt component			96,134,000	345,421,000													22,000	22,000	99,000	111,000
Senior notes, gross					499,875,000	482,000,000	500,000,000	400,000,000	400,000,000	400,000,000	400,000,000	700,000,000	700,000,000	750,000,000	750,000,000	0
Unamortized initial purchaser's discount								(2,339,000)	(2,800,000)
Senior notes								397,661,000	397,200,000
Other Long-term Debt	26,497,000	0
Total long-term debt, net	4,372,538,000	3,738,773,000																			1,079,375,000		0	422,875,000		0	0	1,335,469,000	0	60,550,000
Current portion of long-term debt	153,229,000	414,929,000
Total long-term debt, less current portion, net	4,219,309,000	3,323,844,000
Convertible Notes, Fair Value			97,802,000	372,481,000													22,000	22,000	99,000	111,000
Senior Notes, Fair Value					522,369,000		536,563,000	419,500,000	430,500,000	421,750,000	431,750,000	692,563,000	703,500,000	717,188,000		0
Term Loan Facility Due, Fair Value																					1,078,269,000		0	419,555,000		0	0	1,335,345,000	0	60,686,000
Paladin debt, Fair Value	26,545,000	0
Total long-term debt, net, Fair Value	4,395,662,000	3,870,958,000
Less current portion, net, Fair Value	150,298,000	441,989,000
Total long-term debt, less current portion, net, Fair Value	4,245,364,000	3,428,969,000
Face value of debt instrument																						$ 1,100,000,000			$ 425,000,000
Interest Rate (percent)			1.75%		7.00%	7.00%		7.00%		7.25%		5.75%		5.375%	5.375%		3.25%		4.00%