Debt Obligations - (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jul. 15, 2016	Dec. 31, 2015	Jul. 25, 2011
Convertible Debt		$ 60,000		$ 60,000			$ 60,000
AnnuaL Interest Payment Savings				$ 2,250
Conversion of Stock, Shares Issued				540,000
Debt Instrument, Interest Rate, Stated Percentage								3.75%
Convertible Preferred Stock, Shares Issued upon Conversion								77.241
Note increment for which conversion amount of Common Stock based								$ 1
Debt Instrument, Convertible, Conversion Price								$ 12.95
Class of Warrant or Right, Exercise Price of Warrants or Rights								$ 17.00
Proceeds from Convertible Debt	$ 50,249
Debt Instrument, Unamortized Discount		100		$ 100			1,893
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		15		15			261
Convertible Debt, Current		59,885		59,885			$ 57,846
Contractual Interest Coupon		563	$ 563	1,125	$ 1,125
Amortization of Debt Discount (Premium)		899	815	1,793	1,626
Amortization of Financing Costs		123	104	246	207
Interest Expense, Debt		$ 1,585	$ 1,482	$ 3,164	$ 2,958
Subsequent Event [Member]
Short-term Debt						$ 100,000