Long-Term Debt (Details) (USD $)	3 Months Ended	9 Months Ended			0 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Jul. 16, 2013	Jul. 01, 2018 Cash Convertible Notes [Member]	Jul. 16, 2013 Cash Convertible Notes [Member]	Oct. 01, 2019 CareFirst Convertible Note [Member]	Oct. 01, 2013 CareFirst Convertible Note [Member]
Debt Instrument [Line Items]
Date of Registration Rights Agreement								Oct. 01, 2013
Debt Instrument, Issuance Date						Jul. 16, 2013		Oct. 01, 2013
Debt Instrument, Maturity Date					Jul. 01, 2018		Oct. 01, 2019
Debt Instrument, Interest Rate, Effective Percentage	5.70%	5.70%
Amortization of debt discount	$ 1,714,000	$ 5,018,000	$ 1,497,000
Debt Instrument, Convertible, Conversion Ratio						51.38		22.41
Deferred Finance Costs, Gross						3,939,543
Interest Rate for Notes						1.50%		4.75%
Aggregate Principal of convertible notes						150,000,000		20,000,000
Debt Instrument, Convertible, Conversion Price						$ 19.46
Derivative Asset, Notional Amount	29,600,000	29,600,000
Payments for Hedge, Financing Activities		0	36,750,000			36,750,000
Warrants Strike Price				$ 25.95
Conversion price premium percentage				60.00%
Debt Instrument, Unamortized Discount				$ 36,750,000
CareFirst Warrant Shares for one year period	400,000
CareFirst Warrant Shares Maximum	1,600,000
CareFirst Warrants Issued	125,520	125,520