INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 177,372	$ 146,385	$ 111,217
State	30,268	22,526	27,139
Foreign	3,951	2,827	279
Total current provision	211,591	171,738	138,635
Deferred:
Federal	(743)	634	(3,913)
State	(483)	465	747
Foreign	(7,373)	(3,583)	(1,573)
Total deferred provision	(8,599)	(2,484)	(4,739)
Valuation Allowance	6,142	1,797	3,377
Total provision for income taxes	209,134	171,051	137,273
Federal statutory rate (as a percent)	35.00%
Reconciliation of income tax expense
U.S. Federal tax expense at statutory rates	192,204	160,045	122,256
State income taxes, net of federal tax benefit	20,252	14,917	18,126
Permanent differences	5,968	1,176	1,634
Domestic production deduction	(15,469)	(11,551)	(9,450)
Other	37	4,667	1,330
Valuation Allowance	6,142	1,797	3,377
Total provision for income taxes	$ 209,134	$ 171,051	$ 137,273