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Stock-Based Incentive Plans
9 Months Ended
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