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Stock-Based Incentive Plan (Tables)
6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation, Stock Options, Activity
Stock-based incentive plans compensation expense (in thousands):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Service-based stock appreciation rights ("SARs")
 
$
2,675

 
$
1,731

 
$
4,023

 
$
3,331

Service-based restricted stock units ("RSUs")
 
2,634

 
2,114

 
4,790

 
4,318

Market performance-based restricted stock units
 
959

 
170

 
1,305

 
174

Operating performance-based restricted stock units
 
1,185

 
371

 
2,032

 
407

Total stock-based compensation expense
 
$
7,453

 
$
4,386

 
$
12,150

 
$
8,230

Stock-based compensation agreements issued during the six months ended June 30, 2018, representing potential shares and their weighted average grant date fair values by type follows (shares in thousands, fair value in dollars):
 
 
Six Months Ended June 30, 2018
 
 
Shares
 
Weighted Average Grant Date Fair Value
Service-based SARs
 
634

 
$
27.87

Service-based RSUs
 
227

 
$
91.91

Market performance-based RSUs
 
41

 
$
99.97

Operating performance-based RSUs
 
41

 
$
88.38