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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Condensed consolidating statement of cash flows |  |
Net cash from operating activities | $ 247,215 | $ 221,469
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | (150,722) | (127,736)
Proceeds from sale and disposal of fixed assets | 6,111 | 5,375
Acquisitions, net of cash acquired | (151,023) | (44,432)
Proceeds from sale of business, net of transactional costs | 0 | 46,339
Additions to intangible assets, including costs to obtain or renew permits | (3,500) | (1,348)
Proceeds from sale of available-for-sale securities | 20,123 |
Purchases of available-for-sale securities | (20,471) | 0
Proceeds from sale of available-for-sale securities |  | 376
Borrowing from revolving credit facility | 50,000 | 0
Intercompany | 0 | 0
Net cash used in investing activities | (299,482) | (121,426)
Cash flows used in financing activities: |  |
Change in uncashed checks | (3,476) | (8,657)
Proceeds from exercise of stock options | 0 | 46
Tax payments related to withholdings on vested restricted stock | (2,566) | (2,321)
Repurchases of common stock | (33,581) | (24,465)
Deferred financing costs paid | (3,938) | (5,746)
Premiums paid on early extinguishment of debt | (1,219) | (6,028)
Principal payment on debt | (403,884) | (401,000)
Issuance of senior secured notes, net of discount | 348,250 | 399,000
Intercompany | 0 | 0
Intercompany debt |  | 0
Net cash used in financing activities | (50,414) | (49,171)
Effect of exchange rate change on cash | (1,221) | 3,789
Increase (decrease) in cash and cash equivalents | (103,902) | 54,661
Cash and cash equivalents, beginning of period | 319,399 | 306,997
Cash and cash equivalents, end of period | 215,497 | 361,658
Consolidating Adjustments |  |
Condensed consolidating statement of cash flows |  |
Net cash from operating activities | 0 | 0
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | 0 | 0
Proceeds from sale and disposal of fixed assets | 0 | 0
Acquisitions, net of cash acquired | 0 | 0
Proceeds from sale of business, net of transactional costs |  | 0
Additions to intangible assets, including costs to obtain or renew permits | 0 | 0
Proceeds from sale of available-for-sale securities | 0 |
Purchases of available-for-sale securities | 0 |
Proceeds from sale of available-for-sale securities |  | 0
Borrowing from revolving credit facility | 0 |
Intercompany | 40,031 | 27,740
Intercompany debt |  | 3,701
Net cash used in investing activities | 40,031 | 24,039
Cash flows used in financing activities: |  |
Change in uncashed checks | 0 | 0
Proceeds from exercise of stock options |  | 0
Tax payments related to withholdings on vested restricted stock | 0 | 0
Repurchases of common stock | 0 | 0
Deferred financing costs paid | 0 | 0
Premiums paid on early extinguishment of debt | 0 | 0
Principal payment on debt | 0 | 0
Issuance of senior secured notes, net of discount | 0 | 0
Intercompany | (40,031) | (27,740)
Intercompany debt |  | 3,701
Net cash used in financing activities | (40,031) | (24,039)
Effect of exchange rate change on cash | 0 | 0
Increase (decrease) in cash and cash equivalents | 0 | 0
Cash and cash equivalents, beginning of period | 0 | 0
Cash and cash equivalents, end of period | 0 | 0
Clean Harbors, Inc. | Reportable Legal Entities |  |
Condensed consolidating statement of cash flows |  |
Net cash from operating activities | 8,877 | 16,196
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | 0 | 0
Proceeds from sale and disposal of fixed assets | 0 | 0
Acquisitions, net of cash acquired | 0 | 0
Proceeds from sale of business, net of transactional costs |  | 0
Additions to intangible assets, including costs to obtain or renew permits | 0 | 0
Proceeds from sale of available-for-sale securities | 0 |
Purchases of available-for-sale securities | (1,450) |
Proceeds from sale of available-for-sale securities |  | 376
Borrowing from revolving credit facility | 50,000 |
Intercompany | 0 | 0
Intercompany debt |  | 0
Net cash used in investing activities | (1,450) | 376
Cash flows used in financing activities: |  |
Change in uncashed checks | 0 | 0
Proceeds from exercise of stock options |  | 46
Tax payments related to withholdings on vested restricted stock | (2,566) | (2,321)
Repurchases of common stock | (33,581) | (24,465)
Deferred financing costs paid | (3,938) | (5,746)
Premiums paid on early extinguishment of debt | (1,219) | (6,028)
Principal payment on debt | (403,884) | (401,000)
Issuance of senior secured notes, net of discount | 348,250 | 399,000
Intercompany | 40,031 | 27,740
Intercompany debt |  | (3,701)
Net cash used in financing activities | (6,907) | (16,475)
Effect of exchange rate change on cash | 0 | 0
Increase (decrease) in cash and cash equivalents | 520 | 97
Cash and cash equivalents, beginning of period | 51,638 | 51,417
Cash and cash equivalents, end of period | 52,158 | 51,514
Guarantor Subsidiaries | Reportable Legal Entities |  |
Condensed consolidating statement of cash flows |  |
Net cash from operating activities | 216,369 | 169,715
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | (125,098) | (105,564)
Proceeds from sale and disposal of fixed assets | 3,788 | 1,625
Acquisitions, net of cash acquired | (151,023) | (11,427)
Proceeds from sale of business, net of transactional costs |  | 46,158
Additions to intangible assets, including costs to obtain or renew permits | (3,262) | (1,018)
Proceeds from sale of available-for-sale securities | 0 |
Purchases of available-for-sale securities | 0 |
Proceeds from sale of available-for-sale securities |  | 0
Borrowing from revolving credit facility | 0 |
Intercompany | (40,031) | (27,740)
Intercompany debt |  | 0
Net cash used in investing activities | (315,626) | (97,966)
Cash flows used in financing activities: |  |
Change in uncashed checks | (3,002) | (6,140)
Proceeds from exercise of stock options |  | 0
Tax payments related to withholdings on vested restricted stock | 0 | 0
Repurchases of common stock | 0 | 0
Deferred financing costs paid | 0 | 0
Premiums paid on early extinguishment of debt | 0 | 0
Principal payment on debt | 0 | 0
Issuance of senior secured notes, net of discount | 0 | 0
Intercompany | 0 | 0
Intercompany debt |  | 0
Net cash used in financing activities | (3,002) | (6,140)
Effect of exchange rate change on cash | 0 | 0
Increase (decrease) in cash and cash equivalents | (102,259) | 65,609
Cash and cash equivalents, beginning of period | 207,777 | 155,943
Cash and cash equivalents, end of period | 105,518 | 221,552
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |
Condensed consolidating statement of cash flows |  |
Net cash from operating activities | 21,969 | 35,558
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | (25,624) | (22,172)
Proceeds from sale and disposal of fixed assets | 2,323 | 3,750
Acquisitions, net of cash acquired | 0 | (33,005)
Proceeds from sale of business, net of transactional costs |  | 181
Additions to intangible assets, including costs to obtain or renew permits | (238) | (330)
Proceeds from sale of available-for-sale securities | 20,123 |
Purchases of available-for-sale securities | (19,021) |
Proceeds from sale of available-for-sale securities |  | 0
Borrowing from revolving credit facility | 0 |
Intercompany | 0 | 0
Intercompany debt |  | (3,701)
Net cash used in investing activities | (22,437) | (47,875)
Cash flows used in financing activities: |  |
Change in uncashed checks | (474) | (2,517)
Proceeds from exercise of stock options |  | 0
Tax payments related to withholdings on vested restricted stock | 0 | 0
Repurchases of common stock | 0 | 0
Deferred financing costs paid | 0 | 0
Premiums paid on early extinguishment of debt | 0 | 0
Principal payment on debt | 0 | 0
Issuance of senior secured notes, net of discount | 0 | 0
Intercompany | 0 | 0
Intercompany debt |  | 0
Net cash used in financing activities | (474) | (2,517)
Effect of exchange rate change on cash | (1,221) | 3,789
Increase (decrease) in cash and cash equivalents | (2,163) | (11,045)
Cash and cash equivalents, beginning of period | 59,984 | 99,637
Cash and cash equivalents, end of period | $ 57,821 | $ 88,592

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