Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Composition of income tax expense
Current income tax expense	$ 2,101,000	$ 4,566,000	$ 1,175,000
Deferred income tax expense	1,029,000	1,719,000	2,809,000
Income tax expense	3,130,000	6,285,000	3,984,000
Foreign withholding tax included in current tax expense	$ 1,900,000	$ 36,845	$ 74,929
Effective tax rates reconciliation
Pre-tax book income - US Only (as a percent)	34.00%	34.00%	34.00%
Permanent Items (as a percent)	(164.63%)	0.34%	0.13%
Return to provision true-Ups (as a percent)	27.92%	(0.11%)
Foreign rate differential (as a percent)	(7.43%)	(3.87%)
Branch tax benefit and foreign tax credits (as a percent)	90.23%	(16.93%)
Current/deferred - rate difference (as a percent)	0.85%	0.43%
Change in Valuation allowance (as a percent)	(212.63%)
Deferred foreign tax credit offset (as a percent)	(20.39%)	(1.55%)
State rate change (as a percent)	146.93%
Federal rate change (as a percent)	(152.83%)	(0.86%)
Effective tax rate (as a percent)	(261.83%)	36.17%	34.13%
Puerto Rico
Effective tax rates reconciliation
Pre-tax book income - PR Only (as a percent)	(3.85%)	24.72%