Debt Convertible Notes (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended					12 Months Ended					12 Months Ended
	Apr. 26, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 25, 2012	Dec. 15, 2011	Dec. 31, 2013 Indenture Agreement, December 15 2011	Dec. 31, 2012 Indenture Agreement, December 15 2011	Dec. 31, 2011 Indenture Agreement, December 15 2011	Dec. 20, 2011 Indenture Agreement, December 15 2011	Dec. 15, 2011 Indenture Agreement, December 15 2011	Dec. 31, 2013 Minimum	Dec. 31, 2013 Number of Trading-Days as Defined in the Agreement [Member]	Dec. 31, 2013 Business-Days During Any Defined Consecutive Trading-Day Period in Which the Trading Price Per Note for Each Day of that Measurement Period Was at a Stated % of the Last Reported Sale Price [Member]	Dec. 31, 2013 During Any Calendar Quarter If the Last Sales Price of the Common Stock, for a consecutive number of days, is Equal to or Greater Than Stated Percentage, Consecutive Number of Days
Debt Instrument [Line Items]
Convertible Notes Principal Amount		$ 57,500	$ 57,500	$ 57,500					$ 57,500	$ 7,500	$ 50,000
Convertible debt issued at a percentage of face value, percentage									100.00%
Term of exercise option									30 days
Option to purchase additional principal amount of convertible notes									7,500
Maturity date							Dec. 15, 2017
Stated interest rate on debt							7.00%
Interest Paid		33,266	34,051	7,234			4,025	4,025
Conversion rate, shares per principal amount of convertible notes, shares							97.2384
Conversion rate, principal amount of convertible notes for shares, principal amount							1
Conversion price per share		$ 10.28					$ 10.28
Date at which holders may convert their convertible notes at their option							preceding June 15, 2017
Scenarios in which the holders of convertible notes can convert, days													5 days	20 days	30 days
Measurement Period, Consecutive Trading Days.		5 days
Trading price per note for each day of that measurement period							less than 98%
Last reported sale price of the company's common stock							equal to or greater than 130%
Call of convertible notes for redemption							on or after December 20, 2015
Date on which convertible notes will be convertible							Jun. 15, 2017
Estimated Cash, Surrender of Convertible Notes, Value							57,500
Estimated Common Stock, Surrender of Convertible Notes, Shares							1,537,000
Option to elect out of conversion If issuance would result in a stated increase in common stock outstanding, stated percentage increase		19.99%
Derivative liability for conversion feature associated with convertible debt		0	0	26,440		22,330
Effective interest percentage				17.78%
Plan to issue additional share of common stock, stated as a percentage of common stock outstanding	20.00%
Common Stock, Shares Authorized	60,000,000	60,000,000	60,000,000		30,000,000
Embeded conversion option, value	42,037
Embedded conversion option tax benefit	$ 8,285	$ 0	$ 8,285
Upon fundamental change, percentage of principal amount of convertible notes the company would be required to repurchase		100.00%
Date of redemption							On or after December 20, 2015
Minimum sale price of common stock		135.00%
Period of trading days												20 days
Period of Consecutive Trading Days							30 days
Redemption price		100.00%