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INCOME TAXES. (Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Statutory U.S. federal income tax rate | 35.00% | 35.00% | 35.00%
Impact of U.S. tax reform | 2.90% | 0.00% | 0.00%
State income taxes for current year, net of federal income tax benefits | 3.90% | 3.80% | 4.30%
Net income attributable to redeemable non-controlling interests | (1.30%) | (0.70%) | (0.00%)
Net excess tax benefits from stock-based compensation plans activity | (3.00%) | (1.70%) | (0.00%)
Other items | (0.60%) | (0.40%) | (0.40%)
Effective income tax rate | 36.90% | 36.00% | 38.90%
State income tax benefit related to redeemable non-controlling interests and stock-based compensation | (0.40%) |  |

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- Definition Effective Income Tax Rate Reconciliation, Share-Based Compensation, Excess Tax Benefits (Tax Shortfalls), Percent + References No definition available. + Details
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- Definition Effective Income Tax Rate Reconciliation, State and Local Income Taxes Reflected In Noncontrolling Interest Income (Loss) And Share-based Compensation, Percent + References No definition available. + Details
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- Definition Effective Income Tax Rate Reconciliation, Tax Cuts And Jobs Act Of 2017, Percent + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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