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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of recognized stock-based compensation expense | The following table summarizes share-based compensation expense recognized:
|  | Years ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Restricted stock units |  | $ | 4,231 |  |  | $ | 6,263 |  |  | $ | 3,705 |
Phantom stock units |  |  | 163 |  |  |  | 117 |  |  |  | 141 |
Stock options |  |  | - |  |  |  | - |  |  |  | - |
Total |  | $ | 4,394 |  |  | $ | 6,380 |  |  | $ | 3,846 |
Schedule of unrecognized compensation cost, nonvested awards | The following table summarizes unrecognized compensation cost and the weighted average remaining amortization periods at December 31, 2017 (amortization periods in years):
|  | Unrecognized Compensation Cost |  |  | Weighted Average Remaining Amortization Periods |
Restricted stock units |  | $ | 2,900 |  |  |  | 1.0 |
Phantom stock units |  |  | - |  |  |  | 0.0 |
Stock options |  |  | - |  |  |  | 0.0 |
Total |  | $ | 2,900 |  |  |  |  |
Restricted Stock Units Activity | RSU activity is presented below (number of RSUs in thousands):
|  | Years ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Number of RSUs |  |  | Weighted Average Grant-date Fair Value |  |  | Number of RSUs |  |  | Weighted Average Grant-date Fair Value |  |  | Number of RSUs |  |  | Weighted Average Grant-date Fair Value |
Outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  | 1,004 |  |  | $ | 12.74 |  |  |  | 1,028 |  |  | $ | 13.24 |  |  |  | 1,147 |  |  | $ | 12.75 |
Granted |  |  | 304 |  |  |  | 15.52 |  |  |  | 353 |  |  |  | 11.35 |  |  |  | 349 |  |  |  | 13.60 |
Vested* |  |  | (322 | ) |  |  | 13.54 |  |  |  | (155 | ) |  |  | 12.27 |  |  |  | (182 | ) |  |  | 11.41 |
Cancelled or forfeited |  |  | - |  |  |  | - |  |  |  | (222 | ) |  |  | 13.19 |  |  |  | (286 | ) |  |  | 12.89 |
End of year |  |  | 986 |  |  | $ | 13.34 |  |  |  | 1,004 |  |  | $ | 12.74 |  |  |  | 1,028 |  |  | $ | 13.24 |
Expected to vest |  |  | 986 |  |  |  |  |  |  |  | 1,004 |  |  |  |  |  |  |  | 806 |  |  |  |  |
* The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy statutory tax withholding requirements.
Schedule of share-based compensation arrangement by share-based payment award, performance-based units, vested and expected to vest | The number of performance-based RSUs scheduled to vest increases ratably based on the achievement of defined performance criteria between the established target and maximum levels. RSUs with performance-based vesting criteria are expected to vest as follows (number of RSUs in thousands):
Vesting Date |  | Expected to Vest |  |  | Not Expected to Vest |  |  | Total |
January 1, 2018** |  |  | 202 |  |  |  | - |  |  |  | 202 |
January 1, 2019 |  |  | 213 |  |  |  | - |  |  |  | 213 |
January 1, 2020 |  |  | 167 |  |  |  | - |  |  |  | 167 |
** The performance vesting criteria for the performance-based RSUs with a vesting date of January 1, 2018 were achieved.
Phantom stock units activity under the 2007 Program | The following table summarizes the Company's phantom stock units activity (number of phantom stock units in thousands):
|  | Years ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Number of Phantom Stock Units |  |  | Grant- date Fair Value per Unit |  |  | Number of Phantom Stock Units |  |  | Grant- date Fair Value per Unit |  |  | Number of Phantom Stock Units |  |  | Grant- date Fair Value per Unit |
Outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  | 145 |  |  |  |  |  |  | 132 |  |  |  |  |  |  | 119 |  |  |  |
Granted |  |  | 10 |  |  | $ | 16.25 |  |  |  | 10 |  |  | $ | 11.71 |  |  |  | 10 |  |  | $ | 14.09 |
Dividend equivalents issued |  |  | 2 |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  | 3 |  |  |  |  |
Redeemed for common stock |  |  | - |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  | - |  |  |  |  |
End of year |  |  | 157 |  |  |  |  |  |  |  | 145 |  |  |  |  |  |  |  | 132 |  |  |  |  |

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- Definition Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding performance-based awards that are fully vested and expected to vest. Includes, but is not limited to, unvested awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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