Fair Value Measurements (Narrative) (Details) (USD $)				3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Loans Receivable [Member]	Dec. 31, 2013 Loans Receivable [Member]	Mar. 31, 2014 Qualitest [Member]	Dec. 31, 2013 Qualitest [Member]	Mar. 31, 2014 Maximum [Member] Qualitest [Member]	Mar. 31, 2014 Minimum [Member] Qualitest [Member]	Mar. 31, 2014 Less than twelve months [Member] Equity securities [Member] securities	Dec. 31, 2013 Less than twelve months [Member] Equity securities [Member] securities	Mar. 31, 2014 More than twelve months [Member] Equity securities [Member] securities	Dec. 31, 2013 More than twelve months [Member] Equity securities [Member] securities	Mar. 31, 2014 Secured Debenture [Member]	Mar. 31, 2014 1.75% Convertible Senior Subordinated Notes Due 2015 [Member]	Dec. 31, 2013 1.75% Convertible Senior Subordinated Notes Due 2015 [Member]	Mar. 31, 2014 5.75% Senior Notes Due 2022 [Member]	Dec. 31, 2013 5.75% Senior Notes Due 2022 [Member]	Dec. 19, 2013 5.75% Senior Notes Due 2022 [Member]	Mar. 31, 2013 Paladin Labs Inc. [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Face value of debt instrument												$ 30,000,000.0
Net asset value required to be maintained by money market funds (Per Unit)	1.00
Loans receivable from joint venture		10,463,000	0
Equity Method Investments																		24,300,000
Interest Rate (percent)													1.75%	1.75%	5.75%	5.75%	5.75%
Contingent cash consideration agreement, low							0
Contingent cash consideration agreement, high						7,500,000
Basis points				3.00%
Fair value of contractual obligation				$ 4,800,000	$ 4,700,000
Number of securities in an unrealized loss position								1	1	1	1