Financial Instruments and Risk Management (Financial Assets and Liabilities Carried at Fair Value) (Details) (USD $) In Thousands	Jun. 30, 2011		Dec. 31, 2010
Trading securities	$ 6,400		$ 3,693
Available-for-sale fixed income investments	24,524		25,010
Available-for-sale equity securities	275		382
Derivative assets	630,553	[1],[2]	521,362	[1],[2]
Derivative liabilities	604,213	[1],[2]	505,795	[1],[2]
Equity Securities - Exchange Traded Funds [Member]
Trading securities	6,400		3,693
Equity Securities - Exchange Traded Funds [Member] | Level 1 [Member]
Trading securities	6,400		3,693
Equity Securities - Exchange Traded Funds [Member] | Level 2 [Member]
Trading securities
Biosciences Industry [Member]
Available-for-sale equity securities	275		382
Biosciences Industry [Member] | Level 1 [Member]
Available-for-sale equity securities	275		382
Biosciences Industry [Member] | Level 2 [Member]
Available-for-sale equity securities			0
U.S. Treasuries [Member]
Available-for-sale fixed income investments	12,324		12,387
U.S. Treasuries [Member] | Level 1 [Member]
Available-for-sale fixed income investments
U.S. Treasuries [Member] | Level 2 [Member]
Available-for-sale fixed income investments	12,324		12,387
Corporate Bonds [Member]
Available-for-sale fixed income investments	7,761		8,116
Corporate Bonds [Member] | Level 1 [Member]
Available-for-sale fixed income investments
Corporate Bonds [Member] | Level 2 [Member]
Available-for-sale fixed income investments	7,761		8,116
Agency Mortgage-Backed Securities [Member]
Available-for-sale fixed income investments	1,736		1,934
Agency Mortgage-Backed Securities [Member] | Level 1 [Member]
Available-for-sale fixed income investments
Agency Mortgage-Backed Securities [Member] | Level 2 [Member]
Available-for-sale fixed income investments	1,736		1,934
Other [Member]
Available-for-sale fixed income investments	2,703		2,573
Other [Member] | Level 1 [Member]
Available-for-sale fixed income investments
Other [Member] | Level 2 [Member]
Available-for-sale fixed income investments	2,703		2,573
Foreign Exchange Derivative Assets [Member]
Derivative assets	17,954		19,877
Foreign Exchange Derivative Assets [Member] | Level 1 [Member]
Derivative assets
Foreign Exchange Derivative Assets [Member] | Level 2 [Member]
Derivative assets	17,954		19,877
Purchased Cash Convertible Note Hedge [Member]
Derivative assets	581,400		472,400
Purchased Cash Convertible Note Hedge [Member] | Level 1 [Member]
Derivative assets
Purchased Cash Convertible Note Hedge [Member] | Level 2 [Member]
Derivative assets	581,400		472,400
Foreign Exchange Derivative Liabilities [Member]
Derivative liabilities	1,735		7,729
Foreign Exchange Derivative Liabilities [Member] | Level 1 [Member]
Derivative liabilities
Foreign Exchange Derivative Liabilities [Member] | Level 2 [Member]
Derivative liabilities	1,735		7,729
Interest Rate Swap Derivative Liabilities [Member]
Derivative liabilities	21,078		25,666
Interest Rate Swap Derivative Liabilities [Member] | Level 1 [Member]
Derivative liabilities
Interest Rate Swap Derivative Liabilities [Member] | Level 2 [Member]
Derivative liabilities	21,078		25,666
Cash Conversion Feature of Cash Convertible Notes [Member]
Derivative liabilities	581,400		472,400
Cash Conversion Feature of Cash Convertible Notes [Member] | Level 1 [Member]
Derivative liabilities
Cash Conversion Feature of Cash Convertible Notes [Member] | Level 2 [Member]
Derivative liabilities	581,400		472,400
Level 1 [Member]
Trading securities	6,400		3,693
Available-for-sale fixed income investments
Available-for-sale equity securities	275		382
Derivative assets	6,675	[1],[2]	4,075	[1],[2]
Derivative liabilities		[1],[2]		[1],[2]
Level 2 [Member]
Trading securities
Available-for-sale fixed income investments	24,524		25,010
Available-for-sale equity securities			0
Derivative assets	623,878	[1],[2]	517,287	[1],[2]
Derivative liabilities	$ 604,213	[1],[2]	$ 505,795	[1],[2]

[1] None of the Company's financial assets and liabilities measured at fair value on a recurring basis are valued using Level 3 inputs as of June 30, 2011 or December 31, 2010.

[2] The Company chose not to elect the fair value option for its financial assets and liabilities that had not been previously carried at fair value. Therefore, material financial assets and liabilities not carried at fair value, such as short-term and long-term debt obligations and trade accounts receivable and payable, are still reported at their carrying values.