Debt - Textual (Details) (USD $)	9 Months Ended							9 Months Ended		0 Months Ended		1 Months Ended		9 Months Ended	1 Months Ended					1 Months Ended
	Sep. 30, 2014 institution	Sep. 30, 2013	Dec. 31, 2013 institution	Sep. 30, 2014 Farmadiet Acquisition	Dec. 31, 2013 Farmadiet Acquisition	Sep. 30, 2014 Minimum Farmadiet Acquisition	Sep. 30, 2014 Maximum Farmadiet Acquisition	Sep. 30, 2014 Notes	Dec. 31, 2013 Notes	Aug. 30, 2013 Notes Notes Due February 1, 2033 conversion_right Rate	Jan. 31, 2013 Notes Notes Due February 1, 2033 Rate	Jun. 30, 2014 Notes Notes Due February 1, 2033	Jan. 31, 2013 Notes Notes Due February 1, 2033	Sep. 30, 2014 Notes Notes Due February 1, 2033 Rate	Jan. 31, 2013 Notes Notes Due February 1, 2033 Minimum	Jan. 31, 2013 Notes Notes Due February 1, 2033 Maximum	Jan. 31, 2013 Notes Notes Due February 1, 2033 On or after February 1, 2017 and before February 1, 2019	Sep. 30, 2014 Line of Credit	Dec. 31, 2013 Line of Credit	Jun. 30, 2014 Common stock investments, available for sale Notes Notes Due February 1, 2033
Debt Instrument [Line Items]
Debt face amount													$ 175,000,000.0
Interest rate of notes payable													3.00%	3.00%
Equivalent redemption price											100.00%		100.00%				100.00%
Principal balance				3,119,000	5,234,000			114,883,000	211,912,000					87,600,000
Convertible debt, conversion ratio										141.48	141.48			141.4827
Debt Instrument, Convertible, Conversion Right Triggered										1
Convertible debt, conversion price													$ 7.07	$ 7.07
Convertible debt, threshold percentage of stock price trigger													130.00%
Number of trading days applicable conversion price															20 days
Number of consecutive trading days applicable conversion price																30 days
Debt Conversion, Original Debt, Amount								70,422,000		16,900,000		70,400,000
Convertible debt, stock issued from conversion										2,396,145										10,974,431
Gains (Losses) on Extinguishment of Debt	2,668,000	972,000								1,000,000		2,700,000
Interest Paid	5,222,000	3,126,000										800,000
Gain (loss) on embedded derivative	$ 3,300,000
Number of financial institutions	10		12
Weighted average interest rate				3.30%	3.90%													6.00%	7.70%
Variable interest rates						2.68%	6.30%