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INCOME TAXES. (Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Statutory U.S. federal income tax rate | 21.00% | 21.00% | 35.00%
Impact of nonrecurring charge relating to U.S. tax reform | 0 | 0.008 | 0.029
Impact of nonrecurring charge related to Maryland state tax legislation | 0.00% | 0.30% | 0.00%
State income taxes for current year, net of federal income tax benefits | 4.30% | 4.60% | 3.90%
Net income attributable to redeemable non-controlling interests | (1.00%) | 0.70% | (1.30%)
Net excess tax benefits from stock-based compensation plans activity | (1.50%) | (1.70%) | (3.00%)
Other items | 0.40% | 0.10% | (0.60%)
Effective income tax rate | 23.20% | 25.80% | 36.90%

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