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Condensed consolidating financial information - Cash Flows (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2015 | Mar. 31, 2016 | Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net cash provided by (used in) operating activities |  | $ 14,903 | $ 116,267
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Purchase of property, plant and equipment |  | (3,835) | (12,627)
Restricted and other cash deposits | $ 21,000 | 0 | (21,012)
Net cash used in investing activities |  | (3,835) | (33,639)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Borrowings under revolving credit facilities |  | 371 | 455
Repayments under revolving credit facilities |  | (371) | (455)
Repurchase of common stock |  | 0 | (19,439)
Intercompany transactions |  | 0 | 0
Net cash used in financing activities |  | 0 | (19,439)
CHANGE IN CASH AND CASH EQUIVALENTS |  | 11,068 | 63,189
Cash and cash equivalents, beginning of period | 226,431 | 115,393 | 163,242
Cash and cash equivalents, end of period |  | 126,461 | 226,431
Consolidating Adjustments [Member] |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net cash provided by (used in) operating activities |  | 8,266 | 185,624
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Purchase of property, plant and equipment |  | 0 | 0
Restricted and other cash deposits |  |  | 0
Net cash used in investing activities |  | 0 | 0
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Borrowings under revolving credit facilities |  | 0 | 0
Repayments under revolving credit facilities |  | 0 | 0
Repurchase of common stock |  |  | 0
Intercompany transactions |  | (8,266) | (185,624)
Net cash used in financing activities |  | (8,266) | (185,624)
CHANGE IN CASH AND CASH EQUIVALENTS |  | 0 | 0
Cash and cash equivalents, beginning of period | 0 | 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 |  | (8,754) | 113,179
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Purchase of property, plant and equipment |  | 0 | (348)
Restricted and other cash deposits |  |  | 0
Net cash used in investing activities |  | 0 | (348)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Borrowings under revolving credit facilities |  | 371 | 455
Repayments under revolving credit facilities |  | (371) | (455)
Repurchase of common stock |  |  | (19,439)
Intercompany transactions |  | 0 | 0
Net cash used in financing activities |  | 0 | (19,439)
CHANGE IN CASH AND CASH EQUIVALENTS |  | (8,754) | 93,392
Cash and cash equivalents, beginning of period | 164,075 | 58,421 | 70,683
Cash and cash equivalents, end of period |  | 49,667 | 164,075
Combined Guarantor Subsidiaries [Member] |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net cash provided by (used in) operating activities |  | 5,435 | 40,025
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Purchase of property, plant and equipment |  | (1,426) | (6,726)
Restricted and other cash deposits |  |  | (21,012)
Net cash used in investing activities |  | (1,426) | (27,738)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Borrowings under revolving credit facilities |  | 0 | 0
Repayments under revolving credit facilities |  | 0 | 0
Repurchase of common stock |  |  | 0
Intercompany transactions |  | (436) | (11,164)
Net cash used in financing activities |  | (436) | (11,164)
CHANGE IN CASH AND CASH EQUIVALENTS |  | 3,573 | 1,123
Cash and cash equivalents, beginning of period | (64) | (3,647) | (1,187)
Cash and cash equivalents, end of period |  | (74) | (64)
Combined Non-Guarantor Subsidiaries [Member] |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net cash provided by (used in) operating activities |  | 9,956 | (222,561)
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Purchase of property, plant and equipment |  | (2,409) | (5,553)
Restricted and other cash deposits |  |  | 0
Net cash used in investing activities |  | (2,409) | (5,553)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Borrowings under revolving credit facilities |  | 0 | 0
Repayments under revolving credit facilities |  | 0 | 0
Repurchase of common stock |  |  | 0
Intercompany transactions |  | 8,702 | 196,788
Net cash used in financing activities |  | 8,702 | 196,788
CHANGE IN CASH AND CASH EQUIVALENTS |  | 16,249 | (31,326)
Cash and cash equivalents, beginning of period | $ 62,420 | 60,619 | 93,746
Cash and cash equivalents, end of period |  | $ 76,868 | $ 62,420

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