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Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Operating revenues and Earnings (losses) from unconsolidated affiliates:          
Operating revenues $ 631,355 $ 571,591 $ 1,193,905 $ 1,169,162  
Adjusted income (loss) derived from operating activities          
Adjusted income (loss) derived from operating activities (26,187) (24,957) (90,515) (43,566)  
Earnings (losses) from unconsolidated affiliates   (54,769) 2 (221,920)  
Investment income (loss) (886) 270 (165) 613  
Interest expense (54,688) (45,237) (111,206) (90,967)  
Other, net (10,104) (74,607) (23,614) (257,011)  
Income (loss) from continuing operations before income taxes (134,972) (227,748) (308,209) (676,456)  
ASSETS          
Total assets 8,092,458   8,092,458   $ 8,187,015
Operating segment | Drilling and Rig Services          
Operating revenues and Earnings (losses) from unconsolidated affiliates:          
Operating revenues 677,817 587,231 1,277,223 1,208,309  
Adjusted income (loss) derived from operating activities          
Adjusted income (loss) derived from operating activities (26,187) (24,957) (90,515) (43,566)  
ASSETS          
Total assets 7,489,650   7,489,650   7,461,879
Operating segment | Drilling and Rig Services | Reportable subsegments | U.S.          
Operating revenues and Earnings (losses) from unconsolidated affiliates:          
Operating revenues 187,344 140,342 349,278 289,018  
Adjusted income (loss) derived from operating activities          
Adjusted income (loss) derived from operating activities (56,079) (48,328) (119,261) (95,887)  
ASSETS          
Total assets 3,273,973   3,273,973   3,172,767
Operating segment | Drilling and Rig Services | Reportable subsegments | Canada          
Operating revenues and Earnings (losses) from unconsolidated affiliates:          
Operating revenues 17,121 6,617 44,929 24,111  
Adjusted income (loss) derived from operating activities          
Adjusted income (loss) derived from operating activities (5,014) (10,831) (9,025) (18,109)  
ASSETS          
Total assets 329,744   329,744   329,620
Operating segment | Drilling and Rig Services | Reportable subsegments | International          
Operating revenues and Earnings (losses) from unconsolidated affiliates:          
Operating revenues 380,338 401,024 718,561 802,079  
Adjusted income (loss) derived from operating activities          
Adjusted income (loss) derived from operating activities 36,174 53,859 48,148 100,731  
ASSETS          
Total assets 3,514,574   3,514,574   3,600,057
Operating segment | Drilling and Rig Services | Reportable subsegments | Rig Services          
Operating revenues and Earnings (losses) from unconsolidated affiliates:          
Operating revenues 93,014 39,248 164,455 93,101  
Adjusted income (loss) derived from operating activities          
Adjusted income (loss) derived from operating activities (1,268) (19,657) (10,377) (30,301)  
ASSETS          
Total assets 371,359   371,359   359,435
Other reconciling items (3)          
Operating revenues and Earnings (losses) from unconsolidated affiliates:          
Operating revenues (46,462) (15,640) (83,318) (39,147)  
Adjusted income (loss) derived from operating activities          
Adjusted income (loss) derived from operating activities (43,107) $ (28,448) (82,711) $ (63,605)  
Other reconciling items (5)          
ASSETS          
Total assets $ 602,808   $ 602,808   $ 725,136