Marketable Securities (Current and Non-current Classification of Marketable Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011
Investments, Debt and Equity Securities [Abstract]
Current	$ 174,409		$ 218,789
Non-current	94,742	[1]	68,292	[1]
Total Marketable Securities	$ 269,151		$ 287,081

[1] Deferred compensation plan assets invested in mutual funds are included under the caption “License, manufacturing access fees and other assets, net” on the Company’s consolidated balance sheets.