INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 32,394	$ 18,976	$ 10,766
State	6,386	2,242	2,121
Total Current	38,780	21,218	12,887
Deferred:
Federal	(3,273)	6,242	384
State	(1,030)	2,197	368
Total Deferred	(4,303)	8,439	752
Provision for income taxes	$ 34,477	$ 29,657	$ 13,639
Reconciliation of the federal statutory tax rate to the Company's effective tax rate
Federal statutory tax rate (as a percent)	35.00%	35.00%	35.00%
Increase (decrease) in taxes resulting from:
State income taxes (net of federal effect) (as a percent)	4.30%	4.30%	5.70%
Domestic manufacturing deduction (as a percent)	(2.40%)	(2.00%)	(3.00%)
Adjustments to uncertain tax positions (as a percent)			(2.10%)
Non-deductible acquisition costs (as a percent)			2.30%
Other (as a percent)	(1.80%)	(2.00%)	1.60%
Provision for income taxes (as a percent)	35.10%	35.30%	39.50%