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Financial Instruments and Fair Value (Narrative) (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Aug. 29, 2014
Aug. 28, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Exercise price GES Warrant         $ 11.37 $ 12.74  
Gain (loss) on warrant derivative $ (611,000) $ 351,000 $ 769,000 $ 273,000      
Long-term debt, fair value             18,600,000
Long-term debt $ 0   $ 0       $ 19,780,000
GES warrant
             
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Class of warrant or right, outstanding 2.2   2.2