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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
CONSOLIDATED STATEMENTS OF OPERATIONS |  |  |
Contract revenues | $ 902,729 | $ 998,959 | $ 780,356
Contract costs | 777,852 | 880,306 | 694,790
Gross profit | 124,877 | 118,653 | 85,566
Selling, general and administrative expenses | 69,818 | 63,575 | 56,776
Amortization of intangible assets | 335 | 335 | 335
Gain on sale of property and equipment | (893) | (1,019) | (1,174)
Income from operations | 55,617 | 55,762 | 29,629
Other income (expense): |  |  |
Interest income | 9 | 2 | 53
Interest expense | (727) | (852) | (544)
Other, net | (27) | (222) | (81)
Income before provision for income taxes | 54,872 | 54,690 | 29,057
Income tax expense | 20,113 | 20,428 | 10,759
Net income | $ 34,759 | $ 34,262 | $ 18,298
Income per common share: |  |  |
-Basic (in dollars per share) | $ 1.65 | $ 1.67 | $ 0.90
-Diluted (in dollars per share) | $ 1.61 | $ 1.60 | $ 0.87
Weighted average number of common shares and potential common shares outstanding: |  |  |
-Basic (in shares) | 20,821 | 20,391 | 20,151
-Diluted (in shares) | 21,431 | 21,172 | 20,993

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