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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Condensed consolidating statement of cash flows |  |
Net cash from (used in) operating activities | $ 51,903 | $ 57,119
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | (44,242) | (42,462)
Proceeds from sale and disposal of fixed assets | 798 | 1,030
Acquisitions, net of cash acquired | (120,000) | (11,946)
Proceeds from sale of business | 0 | 2,018
Additions to intangible assets, including costs to obtain or renew permits | (1,245) | (751)
Proceeds from sale of available-for-sale securities | 3,264 |
Purchases of available-for-sale securities | (3,003) | 0
Proceeds from sale of investments |  | 243
Intercompany | 0 | 0
Net cash used in investing activities | (164,428) | (51,868)
Cash flows used in financing activities: |  |
Change in uncashed checks | (3,843) | (7,557)
Proceeds from exercise of stock options | 0 | 46
Tax payments related to withholdings on vested restricted stock | (548) | (1,021)
Repurchases of common stock | (14,264) | (6,796)
Deferred financing costs paid | 0 | (108)
Principal payment on debt | (1,000) | 0
Intercompany | 0 | 0
Net cash used in financing activities | (19,655) | (15,436)
Effect of exchange rate change on cash | (867) | 554
Increase (decrease) in cash and cash equivalents | (133,047) | (9,631)
Cash and cash equivalents, beginning of period | 319,399 | 306,997
Cash and cash equivalents, end of period | 186,352 | 297,366
Consolidating Adjustments |  |
Condensed consolidating statement of cash flows |  |
Net cash from (used in) 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 |  | 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 investments |  | 0
Intercompany | 15,812 | 7,771
Net cash used in investing activities | 15,812 | 7,771
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
Principal payment on debt | 0 |
Intercompany | (15,812) | (7,771)
Net cash used in financing activities | (15,812) | (7,771)
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. |  |
Cash flows used in investing activities: |  |
Proceeds from sale of investments |  | 243
Clean Harbors, Inc. | Reportable Legal Entities |  |
Condensed consolidating statement of cash flows |  |
Net cash from (used in) operating activities | 143 | (1,663)
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 |  | 1,837
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 |
Intercompany | 0 | 0
Net cash used in investing activities | 0 | 2,080
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 | (548) | (1,021)
Repurchases of common stock | (14,264) | (6,796)
Deferred financing costs paid |  | (108)
Principal payment on debt | (1,000) |
Intercompany | 15,812 | 7,771
Net cash used in financing activities | 0 | (108)
Effect of exchange rate change on cash | 0 | 0
Increase (decrease) in cash and cash equivalents | 143 | 309
Cash and cash equivalents, beginning of period | 51,638 | 51,417
Cash and cash equivalents, end of period | 51,781 | 51,726
Guarantor Subsidiaries |  |
Cash flows used in investing activities: |  |
Proceeds from sale of investments |  | 0
Guarantor Subsidiaries | Reportable Legal Entities |  |
Condensed consolidating statement of cash flows |  |
Net cash from (used in) operating activities | 69,536 | 41,144
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | (37,319) | (33,136)
Proceeds from sale and disposal of fixed assets | 292 | 664
Acquisitions, net of cash acquired | (120,000) | (11,946)
Proceeds from sale of business |  | 0
Additions to intangible assets, including costs to obtain or renew permits | (1,234) | (573)
Proceeds from sale of available-for-sale securities | 0 |
Purchases of available-for-sale securities | 0 |
Intercompany | (15,812) | (7,771)
Net cash used in investing activities | (174,073) | (52,762)
Cash flows used in financing activities: |  |
Change in uncashed checks | (3,578) | (5,165)
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
Principal payment on debt | 0 |
Intercompany | 0 | 0
Net cash used in financing activities | (3,578) | (5,165)
Effect of exchange rate change on cash | 0 | 0
Increase (decrease) in cash and cash equivalents | (108,115) | (16,783)
Cash and cash equivalents, beginning of period | 207,777 | 155,943
Cash and cash equivalents, end of period | 99,662 | 139,160
Non-Guarantor Subsidiaries |  |
Cash flows used in investing activities: |  |
Proceeds from sale of investments |  | 0
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |
Condensed consolidating statement of cash flows |  |
Net cash from (used in) operating activities | (17,776) | 17,638
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | (6,923) | (9,326)
Proceeds from sale and disposal of fixed assets | 506 | 366
Acquisitions, net of cash acquired | 0 | 0
Proceeds from sale of business |  | 181
Additions to intangible assets, including costs to obtain or renew permits | (11) | (178)
Proceeds from sale of available-for-sale securities | 3,264 |
Purchases of available-for-sale securities | (3,003) |
Intercompany | 0 | 0
Net cash used in investing activities | (6,167) | (8,957)
Cash flows used in financing activities: |  |
Change in uncashed checks | (265) | (2,392)
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
Principal payment on debt | 0 |
Intercompany | 0 | 0
Net cash used in financing activities | (265) | (2,392)
Effect of exchange rate change on cash | (867) | 554
Increase (decrease) in cash and cash equivalents | (25,075) | 6,843
Cash and cash equivalents, beginning of period | 59,984 | 99,637
Cash and cash equivalents, end of period | $ 34,909 | $ 106,480

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