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Derivative Instruments -Derivative Instruments Gain Loss RMB Warrants (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain (loss) in thousands	$ 41,000	$ 758,000	$ (219,000)	$ 857,000
Life (in months)	14	26	14	26
Volatility	0.53	0.62	0.53	0.62
Stock price (per share)	1.32	0.90	1.32	0.90
Risk free interest rate	0.0036	0.0036	0.0036	0.0036