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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenues $ 202,698 $ 205,111 $ 405,607 $ 413,657
Costs and Expenses        
Operating (excluding depreciation and amortization) 79,115 81,587 160,383 169,482
Selling, general and administrative 52,359 46,279 101,688 93,785
Depreciation and amortization 35,435 33,803 71,814 67,581
166,909 161,669 333,885 330,848
Income from operations 35,789 $ 43,442 71,722 $ 82,809
Interest expense (997)   (997)  
Other income (expense), net 34 $ (32) 15 $ (64)
Income before income taxes 34,826 43,410 70,740 82,745
Provision for income taxes 13,391 16,543 27,196 31,533
Net income $ 21,435 $ 26,867 $ 43,544 $ 51,212
Basic (in dollars per share) $ 3.67 $ 4.60 $ 7.45 $ 8.76
Diluted (in dollars per share) $ 3.67 $ 4.60 $ 7.45 $ 8.76
Basic (in shares) 5,843,313 5,843,313 5,843,313 5,843,313
Diluted (in shares) 5,843,313 5,843,313 5,843,313 5,843,313