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Derivative Financial Instruments (Details 4) (Binomial Lattice Technique [Member], USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Level 1 [Member]
      
Significant assumptions utilized in valuation technique      
Linked common shares 1,725,000 1,800,000 1,725,000
Quoted market price on valuation date $ 3.26 $ 3.11 $ 2.97
Contractual exercise rate $ 2.4648 $ 2.50 $ 2.4648
Term (years) 6 months 11 days 1 year 6 months 11 days 9 months 11 days
Level 1 [Member] | Minimum [Member]
      
Significant assumptions utilized in valuation technique      
Range of market volatilities 33.80% 40.80% 33.10%
Risk free rates using zero coupon US Treasury security rates 0.04% 0.05% 0.02%
Level 1 [Member] | Maximum [Member]
      
Significant assumptions utilized in valuation technique      
Range of market volatilities 44.40% 77.70% 49.17%
Risk free rates using zero coupon US Treasury security rates 0.11% 0.26% 0.11%
Level 2 [Member]
      
Significant assumptions utilized in valuation technique      
Linked common shares 525,000 525,000 525,000
Quoted market price on valuation date $ 3.26 $ 3.11 $ 2.97
Contractual exercise rate $ 2.4648 $ 2.75 $ 2.4648
Term (years) 1 year 15 days 2 years 15 days 1 year 3 months 11 days
Level 2 [Member] | Minimum [Member]
      
Significant assumptions utilized in valuation technique      
Range of market volatilities 34.10% 42.70% 33.80%
Risk free rates using zero coupon US Treasury security rates 0.04% 0.09% 0.02%
Level 2 [Member] | Maximum [Member]
      
Significant assumptions utilized in valuation technique      
Range of market volatilities 45.30% 78.30% 63.60%
Risk free rates using zero coupon US Treasury security rates 0.14% 0.33% 0.16%
Level 3 [Member]
      
Significant assumptions utilized in valuation technique      
Linked common shares 1,562,500 1,302,083 1,562,500
Quoted market price on valuation date $ 3.26 $ 3.11 $ 2.97
Contractual exercise rate $ 3.60 $ 4.32 $ 3.60
Term (years) 4 years 1 month 6 days 5 years 1 month 10 days 4 years 4 months 6 days
Custom lattice variable: Probability of exercisability (434,027 linked common shares)   90.00%  
Level 3 [Member] | Minimum [Member]
      
Significant assumptions utilized in valuation technique      
Range of market volatilities 34.10% 49.00% 39.20%
Risk free rates using zero coupon US Treasury security rates 0.07% 0.07% 0.05%
Level 3 [Member] | Maximum [Member]
      
Significant assumptions utilized in valuation technique      
Range of market volatilities 67.70% 77.40% 70.20%
Risk free rates using zero coupon US Treasury security rates 0.57% 1.04% 0.54%