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Stock-based compensation | 6 Months Ended
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Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Incentive Award Plan and Employee Stock Purchase Plan | 10. Stock-based compensation On March 31, 2015, the Company issued 125,101 shares of common stock under the On Assignment 2010 Employee Stock Purchase Plan (the "ESPP"). Compensation expense related to stock-based compensation, including the ESPP, was $5.2 million and $4.1 million for the three months ended June 30, 2015 and 2014, respectively, of which $5.2 million was included in SG&A expense for 2015; and $3.9 million was included in SG&A expense and $0.2 million was included in income from discontinued operations for 2014 in the accompanying condensed consolidated statements of operations and comprehensive income. Compensation expense related to stock-based compensation, including the ESPP, was $9.2 million and $7.3 million for the six months ended June 30, 2015 and 2014, respectively of which $9.2 million was included in SG&A expense for 2015; and $7.0 million was included in SG&A expense and $0.3 million was included in income from discontinued operations for 2014 in the accompanying condensed consolidated statements of operations and comprehensive income.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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