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Consolidated Statements of Comprehensive Income (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Revenues | $ 267,108,000 | $ 211,507,000 | $ 527,715,000 | $ 419,897,000
Operating costs and expenses: |  |  |  |
Costs of services provided | 230,206,000 | 181,742,000 | 457,701,000 | 361,727,000
Selling, general and administrative | 18,524,000 | 15,511,000 | 39,506,000 | 32,291,000
Other income (loss): |  |  |  |
Investment and interest | (95,000) | 463,000 | 1,558,000 | 1,177,000
Income before income taxes | 18,283,000 | 14,717,000 | 32,066,000 | 27,056,000
Income taxes | 6,963,000 | 4,889,000 | 12,167,000 | 9,461,000
Net income | 11,320,000 | 9,828,000 | 19,899,000 | 17,595,000
Basic earnings per common share | $ 0.17 | $ 0.15 | $ 0.30 | $ 0.26
Diluted earnings per common share | $ 0.17 | $ 0.15 | $ 0.29 | $ 0.26
Cash dividends per common share | $ 0.16 | $ 0.16 | $ 0.32 | $ 0.31
Unrealized gain/(loss) on available for sale marketable securities, net of taxes | (17,000) | 285,000 | (190,000) | 375,000
Comprehensive income | $ 11,303,000 | $ 10,113,000 | $ 19,709,000 | $ 17,970,000
Weighted average number of common shares outstanding |  |  |  |
Basic | 67,296,000 | 66,517,000 | 67,189,000 | 66,459,000
Diluted | 68,228,000 | 67,545,000 | 68,155,000 | 67,499,000

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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