Debt Convertible Notes (Details) (Convertible Notes Due in 2017 [Member], USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 15, 2011
Convertible Notes Due in 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 57,500
Maturity date	Dec. 15, 2017
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Debt Instrument, Convertible, Conversion Rate, Shares Per Principal Amount of Convertible Notes, Shares	97.2384
Debt Instrument, Convertible, Conversion Rate, Principal Amount of Convertible Notes for Shares, Principal Amount	$ 1
Debt Instrument, Convertible, Conversion Price	$ 10.28