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INCOME TAXES. (Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory U.S. federal income tax rate	21.00%	35.00%	35.00%
Impact of nonrecurring charge relating to U.S. tax reform	0.80%	2.90%	0.00%
Impact of nonrecurring charge related to Maryland state tax legislation	0.30%	0.00%	0.00%
State income taxes for current year, net of federal income tax benefits	4.60%	3.90%	3.80%
Net income attributable to redeemable non-controlling interests	0.70%	(1.30%)	(0.70%)
Net excess tax benefits from stock-based compensation plans activity	(1.70%)	(3.00%)	(1.70%)
Other items	0.10%	(0.60%)	(0.40%)
Effective income tax rate	25.80%	36.90%	36.00%

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Effective Income Tax Rate Reconciliation, Share-Based Compensation, Excess Tax Benefits (Tax Shortfalls), Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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