INCOME TAXES - Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal	$ 26,850	$ 45,726	$ 28,699
State	7,575	7,062	5,176
Total current expense	34,425	52,788	33,875
Deferred
Federal	13,964	25,055	32,159
State	3,519	2,297	5,436
Revaluation of deferred tax liabilities, net		(58,313)
Total deferred expense (benefit)	17,483	(30,961)	37,595
Income tax expense	51,908	21,827	71,470
Excess tax benefit recognized	$ 6,848	$ 9,545	$ 631
Valuation allowance percent, compensation agreement deferred tax assets	100.00%
Charge to deferred tax expense for valuation allowance on compensation agreements	$ 2,800
Increase in effective tax rate due to valuation allowance	1.30%