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Stock-Based Incentive Plan (Tables) | 6 Months Ended
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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 |

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