v3.8.0.1

Schedule I, Condensed Financial Statements, Notes (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Profit/(Loss) Reconciliation [Abstract] |  |  |  |
Profit/(loss) for the period | $ (111,804) | $ (4,855) | $ (209,005) |
Additional profit/(loss) if subsidiaries had been accounted for using the equity method of accounting as opposed to cost method | 5,351 | 6,646 | 7,844 |
Equity Reconciliation [Abstract] |  |  |  |
Shareholders equity | 1,895,453 | 1,959,111 | 2,023,501 | $ 1,839,631
Parent [Member] |  |  |  |
Basis of Presentation [Abstract] |  |  |  |
Cash dividend receivable from subsidiaries | 10,383 | 29,737 | 18,400 |
Profit/(Loss) Reconciliation [Abstract] |  |  |  |
Profit/(loss) for the period | 52,565 | 31,263 | (219,615) |
Additional profit/(loss) if subsidiaries had been accounted for using the equity method of accounting as opposed to cost method | (164,369) | (36,118) | 10,610 |
Equity Reconciliation [Abstract] |  |  |  |
Shareholders equity | 2,087,059 | 2,153,420 | 2,158,021 |
Additional shareholders equity if subsidiaries had been accounted for using the equity method of accounting as opposed to cost method | $ (191,606) | $ (194,309) | $ (134,520) |

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