INCOME TAXES - Principal Differences Between Federal Statutory Tax Rate and Income Tax Expense (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	35.00%	34.40%
State taxes, net of federal tax benefit	4.00%	4.00%	2.80%
Excess of foreign tax over US tax on foreign income	0.60%	0.60%	0.80%
Domestic Tax Credits	(10.80%)
Other	(0.90%)	0.10%	1.30%
Effective tax rate	27.90%	39.70%	39.30%