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Stock-Based Incentive Plans | 9 Months Ended
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Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Incentive Plans | Stock-Based Incentive Plans Stock-based incentive plans compensation expense (in thousands):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Service-based stock appreciation rights ("SARs") |  | $ | 2,535 |  |  | $ | 1,983 |  |  | $ | 6,001 |  |  | $ | 6,567 |
Service-based restricted stock units ("RSUs") |  | 2,225 |  |  | 2,517 |  |  | 6,718 |  |  | 8,419 |
Market performance-based restricted stock units |  | 301 |  |  | 14 |  |  | 482 |  |  | 17 |
Operating performance-based restricted stock units |  | 636 |  |  | 254 |  |  | 1,060 |  |  | 572 |
Total stock-based compensation expense |  | $ | 5,697 |  |  | $ | 4,768 |  |  | $ | 14,261 |  |  | $ | 15,575 |
During the nine months ended September 30, 2017, we executed stock-based compensatory award agreements with contract terms agreed upon by us and the respective individuals, as approved by the Compensation Committee of our Board of Directors. Awards with service conditions vest ratably over four years subject to forfeiture unless service conditions are met. Market performance-based awards vest ratably over four years subject to forfeiture unless certain future prices of our shares on the NASDAQ Stock Market exceed certain threshold prices in the first year following the grant date. And finally, operating performance-based awards vest ratably over four years subject to forfeiture unless certain thresholds of adjusted net sales and adjusted net income are met for fiscal year 2017. Compensation expense related to award agreements executed during 2017 for the three and nine months ended September 30, 2017 were $2.0 million and $3.2 million, respectively. Stock-based compensation agreements executed during the nine months ended September 30, 2017, representing potential shares and their weighted average grant date fair values by type follows (shares in thousands, fair value in dollars):
|  | Nine Months Ended September 30, 2017
|  | Shares |  | Weighted Average Grant Date Fair Value
Service-based SARs |  | 639 |  |  | $ | 17.03 |
Service-based RSUs |  | 108 |  |  | $ | 57.37 |
Market performance-based RSUs |  | 158 |  |  | $ | 25.29 |
Operating performance-based RSUs |  | 189 |  |  | $ | 56.18 |

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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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