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Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
Income Taxes (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Taxes
Income tax expense	$ 4,070,252	$ 1,828,984	$ 4,064,115	$ 4,651,528
Actual income tax rate (as a percent)	(221.80%)	49.50%	(221.80%)	49.50%
Statutory federal income tax rate (as a percent)	34.00%	34.00%	34.00%	34.00%
Puerto Rico
Income Taxes
Income tax rate (as a percent)	39.00%		39.00%
Income tax rate before increase (as a percent)	30.00%		30.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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