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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
REVENUES $ 1,721,005 $ 1,595,227 $ 728,974
COSTS AND EXPENSES:      
Cost of revenues (exclusive of items shown separately below) 1,183,048 1,050,809 607,888
Selling, general and administrative expenses 168,151 159,194 150,690
Depreciation and amortization 163,120 163,537 217,258
Gain on disposition of assets, net (3,344) (4,530) (7,920)
Operating profit (loss) 210,030 226,217 (238,942)
Interest expense (489) (426) (681)
Interest income 2,426 1,494 467
Other income (expense), net 9,313 5,531 (204)
Income (loss) before income taxes 221,280 232,816 (239,360)
Income tax provision (benefit) 45,878 70,305 (98,114)
Net income (loss) $ 175,402 $ 162,511 $ (141,246)
EARNINGS (LOSS) PER SHARE      
Basic (in dollars per share) $ 0.82 $ 0.75 $ (0.66)
Diluted (in dollars per share) 0.82 0.75 (0.66)
Dividends paid per share (in dollars per share) $ 0.47 $ 0.20 $ 0.05