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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Employee Benefit Plans | Employee Benefit Plans Long-Term Incentive Stock-Based Plan As of June 30, 2017, there were 2.5 million shares of our common stock available for issuance under our active long-term incentive stock-based plan, the 2005 Long-Term Incentive Plan, as amended and restated January 1, 2017 (the “2005 Incentive Plan”). During the six-month period ended June 30, 2017, the following grants of share-based awards were made under the 2005 Incentive Plan:
Date of Grant |  |  | Shares |  |  |  | Grant Date Fair Value Per Share |  |  | Vesting Period
January 3, 2017 (1) |  |  | 671,771 |  |  |  |  | $ | 8.82 |  |  |  | 33% per year over three years
January 3, 2017 (2) |  |  | 671,771 |  |  |  |  | $ | 12.64 |  |  |  | 100% on January 1, 2020
January 3, 2017 (3) |  |  | 9,956 |  |  |  |  | $ | 8.82 |  |  |  | 100% on January 1, 2019
April 3, 2017 (3) |  |  | 8,004 |  |  |  |  | $ | 7.77 |  |  |  | 100% on January 1, 2019
(1) | Reflects the grant of restricted stock to our executive officers and select management employees.
(2) | Reflects the grant of performance share units (“PSUs”) to our executive officers and select management employees. The PSUs provide for an award based on the performance of our common stock over a three-year period with the maximum amount of the award being 200% of the original awarded PSUs and the minimum amount being zero. For the 2017 awards, vested PSUs can only be settled in shares of our common stock.
(3) | Reflects the grant of restricted stock to certain independent members of our Board of Directors (the “Board”) who have made an election to take their quarterly fees in stock in lieu of cash.
Compensation cost for restricted stock is the product of grant date fair value of each share and the number of shares granted and is recognized over the applicable vesting periods on a straight-line basis. We elected to account for forfeitures when they occur upon the adoption of the new guidance for employee share-based payment accounting (Note 1). For the three- and six-month periods ended June 30, 2017, $1.7 million and $3.7 million, respectively, were recognized as share-based compensation related to restricted stock. For the three- and six-month periods ended June 30, 2016, $1.4 million and $2.9 million, respectively, were recognized as share-based compensation related to restricted stock. The estimated fair value of PSUs is determined using a Monte Carlo simulation model. Compensation cost for PSUs that are accounted for as equity awards is measured based on the estimated grant date fair value and recognized over the vesting period on a straight-line basis. PSUs that are accounted for as liability awards are measured based on the estimated fair value at the balance sheet date and changes in fair value of the awards are recognized in earnings. Cumulative compensation cost for vested liability PSU awards equals the actual cash payout amount upon vesting. The 2017 awards are accounted for as equity awards whereas awards made prior to 2017 are accounted for as liability awards. For the three-month period ended June 30, 2017, we recorded a net reduction of $0.5 million of previously recognized compensation cost related to unvested PSUs. For the six-month period ended June 30, 2017, $1.7 million was recognized as share-based compensation related to PSUs. For the three- and six-month periods ended June 30, 2016, $1.7 million and $2.8 million, respectively, were recognized as share-based compensation related to PSUs. The liability balance for unvested PSUs was $6.8 million at June 30, 2017 and $7.1 million at December 31, 2016. We paid $0.6 million in cash to settle the 2014 grant of PSUs when they vested in January 2017. Employee Stock Purchase Plan We have an employee stock purchase plan (the “ESPP”). The ESPP has 1.5 million shares authorized for issuance, of which 0.7 million shares were available for issuance as of June 30, 2017. In February 2016, we suspended ESPP purchases for the January through April 2016 purchase period and indefinitely imposed a purchase limit of 130 shares per employee for subsequent purchase periods. For more information regarding our employee benefit plans, including our long-term incentive stock-based and cash plans and our employee stock purchase plan, see Note 12 to our 2016 Form 10-K.

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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 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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