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STOCK-BASED COMPENSATION - Other Information (Details) - Restricted Stock - USD ($) | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Stock-based compensation |  |
Fair value, shares vested | $ 6,970,000 | $ 16,194,000
Tax (expense) benefits for compensation tax deductions in excess of compensation expense | (510,000) | $ 1,620,000
Unrecognized compensation cost related to non-vested restricted shares | $ 48,384,000 |
Unrecognized compensation cost related to non-vested restricted shares recognized period | 3 years 10 months 24 days |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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