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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Condensed consolidating statement of cash flows |  |
Net cash (used in) from operating activities | $ 116,931 | $ 120,051
Cash flows from (used in) investing activities: |  |
Additions to property, plant and equipment | (88,742) | (123,529)
Proceeds from sales of fixed assets | 2,121 | 2,668
Acquisitions, net of cash acquired | (9,277) | (58,989)
Proceeds on sale of businesses, net of transactional costs | 46,391 | 0
Additions to intangible assets, including costs to obtain or renew permits | (1,239) | (973)
Purchases of available-for-sale securities | 0 | (598)
Proceeds from sale of investments | 376 | 0
Intercompany | 0 | 0
Investment in subsidiaries |  | 0
Net cash used in investing activities | (50,370) | (181,421)
Cash flows from (used in) financing activities: |  |
Change in uncashed checks | (8,361) | (11,022)
Proceeds from exercise of stock options | 46 | 184
Issuance of restricted shares, net of shares remitted | (2,132) | (1,879)
Repurchases of common stock | (12,257) | (10,134)
Deferred financing costs paid | (4,727) | (2,614)
Excess tax benefit of stock-based compensation | 0 | 2
Premiums paid on early extinguishment of debt | (4,665) | 0
Principal payment on debt | (296,202) | 0
Issuance of senior secured notes, net of discount | 399,000 | 0
Issuance of senior unsecured notes, including premium | 0 | 250,625
Intercompany | 0 | 0
Net cash from financing activities | 70,702 | 225,162
Effect of exchange rate change on cash | 2,106 | 4,423
(Decrease) increase in cash and cash equivalents | 139,369 | 168,215
Cash and cash equivalents, beginning of period | 306,997 | 184,708
Cash and cash equivalents, end of period | 446,366 | 352,923
Consolidating Adjustments |  |
Condensed consolidating statement of cash flows |  |
Net cash (used in) from operating activities | 0 | 0
Cash flows from (used in) investing activities: |  |
Additions to property, plant and equipment | 0 | 0
Proceeds from sales of fixed assets | 0 | 0
Acquisitions, net of cash acquired | 0 | 0
Proceeds on sale of businesses, net of transactional costs | 0 |
Additions to intangible assets, including costs to obtain or renew permits | 0 | 0
Purchases of available-for-sale securities |  | 0
Proceeds from sale of investments | 0 |
Intercompany | 14,343 | 11,827
Investment in subsidiaries |  | 250,625
Net cash used in investing activities | 14,343 | 262,452
Cash flows from (used in) financing activities: |  |
Change in uncashed checks | 0 | 0
Proceeds from exercise of stock options | 0 | 0
Issuance of restricted shares, net of shares remitted | 0 | 0
Repurchases of common stock | 0 | 0
Deferred financing costs paid | 0 | 0
Excess tax benefit of stock-based compensation |  | 0
Premiums paid on early extinguishment of debt | 0 |
Principal payment on debt | 0 |
Issuance of senior secured notes, net of discount | 0 |
Issuance of senior unsecured notes, including premium |  | (250,625)
Intercompany | (14,343) | (11,827)
Net cash from financing activities | (14,343) | (262,452)
Effect of exchange rate change on cash | 0 | 0
(Decrease) increase 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 (used in) from operating activities | (93,808) | 42,990
Cash flows from (used in) investing activities: |  |
Additions to property, plant and equipment | 0 | 0
Proceeds from sales of fixed assets | 0 | 0
Acquisitions, net of cash acquired | 0 | 0
Proceeds on sale of businesses, net of transactional costs | 0 |
Additions to intangible assets, including costs to obtain or renew permits | 0 | 0
Purchases of available-for-sale securities |  | (102)
Proceeds from sale of investments | 376 |
Intercompany | 0 | 0
Investment in subsidiaries |  | (250,625)
Net cash used in investing activities | 376 | (250,727)
Cash flows from (used in) financing activities: |  |
Change in uncashed checks | 0 | 0
Proceeds from exercise of stock options | 46 | 184
Issuance of restricted shares, net of shares remitted | (2,132) | (1,879)
Repurchases of common stock | (12,257) | (10,134)
Deferred financing costs paid | (4,727) | (2,614)
Excess tax benefit of stock-based compensation |  | 2
Premiums paid on early extinguishment of debt | (4,665) |
Principal payment on debt | (296,202) |
Issuance of senior secured notes, net of discount | 399,000 |
Issuance of senior unsecured notes, including premium |  | 250,625
Intercompany | 14,343 | 11,827
Net cash from financing activities | 93,406 | 248,011
Effect of exchange rate change on cash | 0 | 0
(Decrease) increase in cash and cash equivalents | (26) | 40,274
Cash and cash equivalents, beginning of period | 51,417 | 11,017
Cash and cash equivalents, end of period | 51,391 | 51,291
Guarantor Subsidiaries | Reportable Legal Entities |  |
Condensed consolidating statement of cash flows |  |
Net cash (used in) from operating activities | 206,496 | 65,860
Cash flows from (used in) investing activities: |  |
Additions to property, plant and equipment | (75,152) | (105,175)
Proceeds from sales of fixed assets | 984 | 694
Acquisitions, net of cash acquired | (9,277) | (48,989)
Proceeds on sale of businesses, net of transactional costs | 46,210 |
Additions to intangible assets, including costs to obtain or renew permits | (888) | (908)
Purchases of available-for-sale securities |  | 0
Proceeds from sale of investments | 0 |
Intercompany | (14,343) | (11,827)
Investment in subsidiaries |  | 0
Net cash used in investing activities | (52,466) | (166,205)
Cash flows from (used in) financing activities: |  |
Change in uncashed checks | (5,977) | (9,266)
Proceeds from exercise of stock options | 0 | 0
Issuance of restricted shares, net of shares remitted | 0 | 0
Repurchases of common stock | 0 | 0
Deferred financing costs paid | 0 | 0
Excess tax benefit of stock-based compensation |  | 0
Premiums paid on early extinguishment of debt | 0 |
Principal payment on debt | 0 |
Issuance of senior secured notes, net of discount | 0 |
Issuance of senior unsecured notes, including premium |  | 250,625
Intercompany | 0 | 0
Net cash from financing activities | (5,977) | 241,359
Effect of exchange rate change on cash | 0 | 0
(Decrease) increase in cash and cash equivalents | 148,053 | 141,014
Cash and cash equivalents, beginning of period | 155,943 | 83,479
Cash and cash equivalents, end of period | 303,996 | 224,493
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |
Condensed consolidating statement of cash flows |  |
Net cash (used in) from operating activities | 4,243 | 11,201
Cash flows from (used in) investing activities: |  |
Additions to property, plant and equipment | (13,590) | (18,354)
Proceeds from sales of fixed assets | 1,137 | 1,974
Acquisitions, net of cash acquired | 0 | (10,000)
Proceeds on sale of businesses, net of transactional costs | 181 |
Additions to intangible assets, including costs to obtain or renew permits | (351) | (65)
Purchases of available-for-sale securities |  | (496)
Proceeds from sale of investments | 0 |
Intercompany | 0 | 0
Investment in subsidiaries |  | 0
Net cash used in investing activities | (12,623) | (26,941)
Cash flows from (used in) financing activities: |  |
Change in uncashed checks | (2,384) | (1,756)
Proceeds from exercise of stock options | 0 | 0
Issuance of restricted shares, net of shares remitted | 0 | 0
Repurchases of common stock | 0 | 0
Deferred financing costs paid | 0 | 0
Excess tax benefit of stock-based compensation |  | 0
Premiums paid on early extinguishment of debt | 0 |
Principal payment on debt | 0 |
Issuance of senior secured notes, net of discount | 0 |
Issuance of senior unsecured notes, including premium |  | 0
Intercompany | 0 | 0
Net cash from financing activities | (2,384) | (1,756)
Effect of exchange rate change on cash | 2,106 | 4,423
(Decrease) increase in cash and cash equivalents | (8,658) | (13,073)
Cash and cash equivalents, beginning of period | 99,637 | 90,212
Cash and cash equivalents, end of period | $ 90,979 | $ 77,139

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