For stock-based awards, the Company recognized compensation expense based on the grant date fair value. Share-based compensation expense was $6.6 million and $4.7 million for the three months ended March 31, 2017 and 2016, respectively.

A summary of the status and changes of the Company’s nonvested shares related to the 2007 Incentive Award Plan (the “2007 Plan”), as of and for the three months ended March 31, 2017 is presented below:

As of March 31, 2017, there was $58.7 million of unrecognized compensation cost related to nonvested common shares. The cost is expected to be amortized over a weighted average period of 2.4 years.

In March 2016, the FASB issued ASU No. 2016-09, “Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting” (“ASU 2016-09”). The updated guidance changes how companies account for certain aspects of share-based payment awards to employees, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. As of January 1, 2017, the calculation of diluted weighted average shares outstanding was changed prospectively to no longer include excess tax benefits as assumed proceeds. This change did not have a material impact on the Company’s calculation of diluted earnings per share. Additionally, this ASU requires the recognition of excess tax benefits and deficiencies as income tax benefits or expenses in the income statement rather than to additional paid-in capital, which has been applied on a prospective basis to settlements of share-based payment awards occurring on or after January 1, 2017. The Company adopted ASU 2016-09 during the quarter ended March 31, 2017 and recorded a $1.4 million tax benefit in the condensed consolidated statement of earnings. ASU 2016-09 also requires that excess tax benefits be presented as operating activities on the statement of cash flows, which the Company has elected to apply on a prospective basis.