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Condensed consolidating financial information - Cash Flows (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | $ 50,667 | $ 15,327
Net cash provided by (used in) investing activities |  |
Purchase of property, plant and equipment | (23,590) | (13,127)
Proceeds from sale of property, plant and equipment | 14,452 | 0
Intercompany transactions | 0 |
Net cash used in investing activities | (9,138) | (13,127)
Net cash provided by (used in) financing activities |  |
Borrowings under revolving credit facilities | 1,022 | 900
Repayments under revolving credit facilities | (1,022) | (900)
Issuance of common stock | 281 | 0
Intercompany transactions | 0 | 0
Net cash provided by financing activities | 281 | 0
CHANGE IN CASH AND CASH EQUIVALENTS | 41,810 | 2,200
Cash and cash equivalents, beginning of period | 132,403 | 115,393
Cash and cash equivalents, end of period | 174,213 | 117,593
Consolidating Adjustments [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | 0 | 15,985
Net cash provided by (used in) investing activities |  |
Purchase of property, plant and equipment | 0 | 0
Proceeds from sale of property, plant and equipment | 0 |
Intercompany transactions | (614) |
Net cash used in investing activities | (614) | 0
Net cash provided by (used in) financing activities |  |
Borrowings under revolving credit facilities | 0 | 0
Repayments under revolving credit facilities | 0 | 0
Issuance of common stock | 0 |
Intercompany transactions | 614 | (15,985)
Net cash provided by financing activities | 614 | (15,985)
CHANGE 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
The Company [Member] | Reportable Legal Entities [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | (25,306) | (20,816)
Net cash provided by (used in) investing activities |  |
Purchase of property, plant and equipment | (8,773) | 0
Proceeds from sale of property, plant and equipment | 0 |
Intercompany transactions | 34,249 |
Net cash used in investing activities | 25,476 | 0
Net cash provided by (used in) financing activities |  |
Borrowings under revolving credit facilities | 1,022 | 900
Repayments under revolving credit facilities | (1,022) | (900)
Issuance of common stock | 281 |
Intercompany transactions | 33,631 | 0
Net cash provided by financing activities | 33,912 | 0
CHANGE IN CASH AND CASH EQUIVALENTS | 34,082 | (20,816)
Cash and cash equivalents, beginning of period | 36,670 | 58,421
Cash and cash equivalents, end of period | 70,752 | 37,605
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | 14,298 | 23,045
Net cash provided by (used in) investing activities |  |
Purchase of property, plant and equipment | (5,880) | (4,252)
Proceeds from sale of property, plant and equipment | 831 |
Intercompany transactions | (25,996) |
Net cash used in investing activities | (31,045) | (4,252)
Net cash provided by (used in) financing activities |  |
Borrowings under revolving credit facilities | 0 | 0
Repayments under revolving credit facilities | 0 | 0
Issuance of common stock | 0 |
Intercompany transactions | 16,785 | (15,271)
Net cash provided by financing activities | 16,785 | (15,271)
CHANGE IN CASH AND CASH EQUIVALENTS | 38 | 3,522
Cash and cash equivalents, beginning of period | (255) | (3,647)
Cash and cash equivalents, end of period | (217) | (125)
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | 61,675 | (2,887)
Net cash provided by (used in) investing activities |  |
Purchase of property, plant and equipment | (8,937) | (8,875)
Proceeds from sale of property, plant and equipment | 13,621 |
Intercompany transactions | (7,639) |
Net cash used in investing activities | (2,955) | (8,875)
Net cash provided by (used in) financing activities |  |
Borrowings under revolving credit facilities | 0 | 0
Repayments under revolving credit facilities | 0 | 0
Issuance of common stock | 0 |
Intercompany transactions | (51,030) | 31,256
Net cash provided by financing activities | (51,030) | 31,256
CHANGE IN CASH AND CASH EQUIVALENTS | 7,690 | 19,494
Cash and cash equivalents, beginning of period | 95,988 | 60,619
Cash and cash equivalents, end of period | $ 103,678 | $ 80,113

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