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Accounting for stock-based compensation | 9 Months Ended
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Sep. 30, 2014
Accounting for stock-based compensation | 3. Accounting for stock-based compensation Total stock-based compensation expense recognized in the accompanying condensed consolidated statements of operations for the three and nine months ended September 30, 2014 and 2013 was as follows (in thousands):
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Stock-based compensation |  | $ | (4,827 | ) |  | $ | 15,943 |  |  | $ | 46,755 |  |  | $ | 31,304 |
During the three months ended March 31, 2014, the Company issued stock awards to employees primarily with a four-year vesting schedule. The grant date fair value of the 46,400 restricted stock units and 17,700 stock options issued were $296,000 and $81,000, respectively, with a grant date fair value per share of $6.39 and $4.58, respectively. During the three months ended June 30, 2014, the Company issued stock awards to employees primarily with a four-year vesting schedule as well as non-employee directors primarily with a three-year vesting schedule. The grant date fair value of the 158,600 restricted stock units and 252,600 stock options issued were $1.23 million and $1.32 million, respectively. The grant date fair value per share was $7.76 for restricted stock units, $5.31 for employee stock options and $5.22 for non-employee director stock options. On June 30, 2014, the Company modified certain performance grants to allow 124 employees to withhold in excess of the minimum statutory requirements for performance-based restricted stock units at the employee’s discretion through December 31, 2014. The modification resulted in the reclassification of these performance grants from equity awards to liability awards, which require re-measurement at the end of each reporting period through settlement. Consequently, as of June 30, 2014, the reclassification and re-measurement of these performance-based restricted stock units resulted in an increase in stock-based compensation expense of $35.9 million. During the three months ended September 30, 2014, the performance shares related to the modification settled. The performance grants were re-measured on their respective settlement dates, which resulted in a credit to stock compensation expense of $12.9 million. As of September 30, 2014, there were no remaining liability awards. During the three months ended September 30, 2014, the Company issued stock awards to employees primarily with a four-year vesting schedule. The grant date fair value of the 720,000 restricted stock units and 1,053,900 stock options issued were $5.1 million and $4.9 million, respectively, with a grant date fair value per share of $7.09 and $4.66, respectively. As of September 30, 2014, there was $10.3 million of unrecognized compensation cost related to options and $12.5 million of unrecognized compensation cost related to restricted stock units, which are expected to be recognized over the remaining weighted average vesting period of 3.0 years. The Company evaluates stock awards with performance conditions as to the probability that the performance conditions will be met and estimates the date at which the performance conditions will be met in order to properly recognize stock-based compensation expense over the requisite service period. As of September 30, 2014, there were no awards with milestones not considered probable of achievement.

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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 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 3: 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=6406099&loc=d3e25284-112666 Reference 4: 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 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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