INCOME TAXES - Principal differences between federal statutory tax rate and income tax expense (Details 1)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
State taxes, net of federal tax benefit	3.70%	4.00%	4.00%
Excess of foreign tax over US tax on foreign income	0.30%	0.60%	0.60%
Domestic Tax Credits	(1.50%)	(10.80%)
Other	(0.20%)	(0.90%)	0.10%
Effective tax rate	37.30%	27.90%	39.70%