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Condensed consolidating financial information - Cash Flows (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | $ 3,093 | $ 23,603
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Purchase of property, plant and equipment | (18,843) | (7,734)
Proceeds from sale of property, plant and equipment | 13,585 | 0
Restricted and other cash deposits | 195 | (1,878)
Intercompany transactions | 0 |
Net cash used in investing activities | (5,063) | (9,612)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Borrowings under revolving credit facilities | 720 | 595
Repayments under revolving credit facilities | (720) | (595)
Issuance of common stock | 240 | 0
Intercompany transactions | 0 | 0
Net cash provided by financing activities | 240 | 0
CHANGE IN CASH AND CASH EQUIVALENTS | (1,730) | 13,991
Cash and cash equivalents, beginning of period | 132,403 | 115,393
Cash and cash equivalents, end of period | 130,673 | 129,384
Consolidating Adjustments [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | 0 | 4,593
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Purchase of property, plant and equipment | 0 | 0
Proceeds from sale of property, plant and equipment | 0 |
Restricted and other cash deposits | 0 | 0
Intercompany transactions | 28,208 |
Net cash used in investing activities | 28,208 | 0
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Borrowings under revolving credit facilities | 0 | 0
Repayments under revolving credit facilities | 0 | 0
Issuance of common stock | 0 |
Intercompany transactions | (28,208) | (4,593)
Net cash provided by financing activities | (28,208) | (4,593)
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] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | (7,988) | (11,105)
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Purchase of property, plant and equipment | (7,811) | 0
Proceeds from sale of property, plant and equipment | 0 |
Restricted and other cash deposits | 0 | 0
Intercompany transactions | 11,784 |
Net cash used in investing activities | 3,973 | 0
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Borrowings under revolving credit facilities | 720 | 595
Repayments under revolving credit facilities | (720) | (595)
Issuance of common stock | 240 |
Intercompany transactions | (3,590) | 0
Net cash provided by financing activities | (3,350) | 0
CHANGE IN CASH AND CASH EQUIVALENTS | (7,365) | (11,105)
Cash and cash equivalents, beginning of period | 36,670 | 58,421
Cash and cash equivalents, end of period | 29,305 | 47,316
Combined Guarantor Subsidiaries [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | (25,946) | 18,847
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Purchase of property, plant and equipment | (4,963) | (2,697)
Proceeds from sale of property, plant and equipment | 0 |
Restricted and other cash deposits | (6) | (4)
Intercompany transactions | (27,931) |
Net cash used in investing activities | (32,900) | (2,701)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Borrowings under revolving credit facilities | 0 | 0
Repayments under revolving credit facilities | 0 | 0
Issuance of common stock | 0 |
Intercompany transactions | 58,831 | (12,777)
Net cash provided by financing activities | 58,831 | (12,777)
CHANGE IN CASH AND CASH EQUIVALENTS | (15) | 3,369
Cash and cash equivalents, beginning of period | (255) | (3,647)
Cash and cash equivalents, end of period | (270) | (278)
Combined Non-Guarantor Subsidiaries [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | 37,027 | 11,268
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Purchase of property, plant and equipment | (6,069) | (5,037)
Proceeds from sale of property, plant and equipment | 13,585 |
Restricted and other cash deposits | 201 | (1,874)
Intercompany transactions | (12,061) |
Net cash used in investing activities | (4,344) | (6,911)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Borrowings under revolving credit facilities | 0 | 0
Repayments under revolving credit facilities | 0 | 0
Issuance of common stock | 0 |
Intercompany transactions | (27,033) | 17,370
Net cash provided by financing activities | (27,033) | 17,370
CHANGE IN CASH AND CASH EQUIVALENTS | 5,650 | 21,727
Cash and cash equivalents, beginning of period | 95,988 | 60,619
Cash and cash equivalents, end of period | $ 101,638 | $ 82,346

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