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COMMITMENTS AND CONTINGENCIES - Lease Commitments (Details) $ in Thousands, ft² in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) ft² | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
COMMITMENTS AND CONTINGENCIES |  |  |
Area of lease (in square feet) | ft² | 2.5 |  |
Obligation for payments under leases |  |  |
2018 | $ 24,385 |  |
2019 | 21,692 |  |
2020 | 17,332 |  |
2021 | 9,823 |  |
2022 | 5,868 |  |
Thereafter | 9,087 |  |
Total obligations under operating leases | 88,187 |  |
Rent expense |  |  |
Rent expense | $ 20,900 | $ 19,800 | $ 17,000

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- Definition Amount of contractual obligation due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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