Organization and Summary of Significant Accounting Policies (Details 1) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Numerator for basic and diluted earning per share:
Net income	$ 3,297,821	$ 3,803,818
Denominator:
Weighted average shares outstanding - basic	52,746,178	55,700,395
Dilutive effect of stock-based awards	1,853,802	657,671
Diluted weighted average shares outstanding	54,599,980	56,358,066
Anti-dilutive stock-based awards excluded	1,232,111	6,537,984
Net income per common share:
Basic	$ 0.06	$ 0.07
Diluted	$ 0.06	$ 0.07

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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