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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Operating revenues:        
Drilling - U.S. Land $ 330,967 $ 349,283 $ 594,603 $ 719,088
Drilling - Offshore 36,235 34,325 70,047 76,205
Drilling - International Land 34,757 51,352 102,788 123,546
Other 3,324 3,231 6,435 7,199
Total operating revenues 405,283 438,191 773,873 926,038
Operating costs and other:        
Operating costs, excluding depreciation 296,829 221,611 544,508 498,255
Depreciation 152,777 141,517 286,624 283,646
Research and development 2,719 2,315 5,527 5,234
General and administrative 33,519 33,811 67,781 65,885
Income from asset sales (14,889) (2,684) (15,731) (7,273)
Total operating costs and expenses 470,955 396,570 888,709 845,747
Operating income (loss) from continuing operations (65,672) 41,621 (114,836) 80,291
Other income (expense):        
Interest and dividend income 1,338 799 2,328 1,532
Interest expense (6,084) (5,721) (11,139) (10,245)
Other 174 653 561 392
Total other income (expense) (4,572) (4,269) (8,250) (8,321)
Income (loss) from continuing operations before income taxes (70,244) 37,352 (123,086) 71,970
Income tax provision (21,771) 12,178 (40,059) 30,898
Income (loss) from continuing operations (48,473) 25,174 (83,027) 41,072
Income (loss) from discontinued operations before income taxes (94) (56) (518) 48
Income tax provision 251 3,913 336 3,913
Loss from discontinued operations (345) (3,969) (854) (3,865)
NET INCOME (LOSS) $ (48,818) $ 21,205 $ (83,881) $ 37,207
Basic earnings per common share:        
Income (loss) from continuing operations (in dollars per share) $ (0.45) $ 0.23 $ (0.77) $ 0.38
Loss from discontinued operations (in dollars per share)   (0.04) (0.01) (0.04)
Net income (loss) (in dollars per share) (0.45) 0.19 (0.78) 0.34
Diluted earnings per common share:        
Income (loss) from continuing operations (in dollars per share) (0.45) 0.23 (0.77) 0.37
Loss from discontinued operations (in dollars per share)   (0.04) (0.01) (0.04)
Net income (loss) (in dollars per share) $ (0.45) $ 0.19 $ (0.78) $ 0.33
Weighted average shares outstanding (in thousands):        
Basic (in shares) 108,565 108,014 108,419 107,933
Diluted (in shares) 108,565 108,466 108,419 108,430
Dividends declared per common share (in dollars per share) $ 0.7000 $ 0.6875 $ 1.40 $ 1.3750