INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current:
Federal	$ 146,385	$ 111,217	$ 107,503
State	22,526	27,139	22,332
Foreign	2,827	279	309
Total current provision	171,738	138,635	130,144
Deferred:
Federal	634	(3,913)	(1,941)
State	465	747	9
Foreign	(3,583)	(1,573)	(1,233)
Total deferred provision	(2,484)	(4,739)	(3,165)
Valuation Allowance	1,797	3,377
Total provision for income taxes	171,051	137,273	126,979
Federal statutory rate (as a percent)	35.00%
Reconciliation of income tax expense
U.S. Federal tax expense at statutory rates	160,045	122,256	117,510
State income taxes, net of federal tax benefit	14,917	18,126	14,819
Permanent differences	1,176	1,634	977
Domestic production deduction	(11,551)	(9,450)	(8,495)
Other	4,667	1,330	2,168
Valuation Allowance	1,797	3,377
Total provision for income taxes	$ 171,051	$ 137,273	$ 126,979