Debt - Textual (Details) (USD $)	9 Months Ended								0 Months Ended	1 Months Ended	9 Months Ended		9 Months Ended
	Sep. 30, 2013 institution	Sep. 30, 2012	Sep. 30, 2013 Farmadiet Acquisition [Member]	Dec. 31, 2012 Farmadiet Acquisition [Member]	Sep. 30, 2013 Minimum [Member] Farmadiet Acquisition [Member]	Sep. 30, 2013 Maximum [Member] Farmadiet Acquisition [Member]	Sep. 30, 2013 Notes [Member]	Jan. 30, 2013 Notes [Member]	Aug. 29, 2013 Notes [Member] Notes Due February 1, 2033 [Member] conversion_right	Jan. 30, 2013 Notes [Member] Notes Due February 1, 2033 [Member] Rate	Sep. 30, 2013 Notes [Member] Notes Due February 1, 2033 [Member] Rate	Dec. 31, 2012 Notes [Member] Notes Due February 1, 2033 [Member]	Sep. 30, 2013 Notes [Member] Notes Due February 1, 2033 [Member] Minimum [Member]	Sep. 30, 2013 Notes [Member] Notes Due February 1, 2033 [Member] Maximum [Member]	Sep. 30, 2013 Notes [Member] Notes Due February 1, 2033 [Member] On or after February 1, 2017 and before February 1, 2019 [Member]	Sep. 30, 2013 Notes [Member] Notes Due February 1, 2033 [Member] On or after February 1, 2019 [Member]	Sep. 30, 2013 Line of Credit [Member]	Dec. 31, 2012 Line of Credit [Member]
Debt Instrument [Line Items]
Principal balance			$ 5,146,000	$ 6,247,000			$ 208,917,000	$ 175,000,000			$ 158,100,000
Debt face amount										175,000,000.0
Interest rate of notes payable	3.00%									3.00%	3.00%	3.00%
Equivalent redemption price											100.00%				100.00%	100.00%
Convertible debt, conversion ratio									141.4827	141.4827	141.4827
Convertible debt, principal amount for conversion									1,000
Loss on conversion of 3.00% convertible senior notes	(8,688,000)	0							8,700,000
Convertible debt, conversion price										$ 7.07	$ 7.07
Convertible debt, conversion right triggered									1
Convertible debt, threshold percentage of stock price trigger											130.00%
Convertible debt, converted amount		0							16,900,000		20,839,000
Convertible debt, stock issued from conversion									2,396,145
Number of trading days applicable conversion price													20 days
Number of consecutive trading days applicable conversion price														30 days
Gain (loss) on embedded derivative	$ 41,800,000
Number of financial institutions	15
Weighted average interest rate			4.20%	4.50%													7.40%	6.50%
Variable interest rates					2.70%	6.30%