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Accounting for Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Activity | The following table summarizes stock option activity during the three year period ended December 31, 2015:
Options |  | Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2012 |  |  | 2,129,929 |  |  | $ | 8.82 |  |  |  |  |  |  |  |  |
Granted |  |  | 510,000 |  |  |  | 19.64 |  |  |  |  |  |  |  |  |
Exercised |  |  | (672,753 | ) |  |  | 7.21 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (24,000 | ) |  |  | 11.27 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 1,943,176 |  |  | $ | 12.19 |  |  |  | 5.31 |  |  | $ | 28,379 |
Granted |  |  | 605,000 |  |  |  | 30.15 |  |  |  |  |  |  |  |  |
Exercised |  |  | (731,142 | ) |  |  | 9.84 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (142,500 | ) |  |  | 18.94 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2014 |  |  | 1,674,534 |  |  | $ | 19.14 |  |  |  | 5.10 |  |  | $ | 29,886 |
Granted |  |  | 524,534 |  |  |  | 41.97 |  |  |  |  |  |  |  |  |
Exercised |  |  | (571,723 | ) |  |  | 16.21 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (96,500 | ) |  |  | 28.47 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 1,530,845 |  |  | $ | 27.46 |  |  |  | 4.97 |  |  | $ | 30,573 |
Exercisable at December 31, 2013 |  |  | 1,055,176 |  |  | $ | 12.21 |  |  |  | 4.58 |  |  | $ | 19,314 |
Exercisable at December 31, 2014 |  |  | 632,034 |  |  | $ | 10.13 |  |  |  | 3.97 |  |  | $ | 16,744 |
Exercisable at December 31, 2015 |  |  | 439,561 |  |  | $ | $12.18 |  |  |  | 3.51 |  |  | $ | 15,480 |
Fair Value of Option on Date of Grant | The fair value of each option is estimated on the date of grant using the Black-Scholes option-pricing model. This model incorporates certain assumptions for inputs including a risk-free interest rate, expected dividend yield of the underlying Common Stock, expected option life and expected volatility in the market value of the underlying Common Stock. The following assumptions were used for options issued in the following periods:
|  | 2015 |  | 2014 |  | 2013
Expected volatility |  | 35% |  | 37% |  | 34%
Weighted average expected volatility |  | 35% |  | 37% |  | 34%
Expected lives |  | 3 yrs. |  | 3 yrs. |  | 3 yrs.
Risk-free interest rate |  | 1.00% |  | 0.60-1.00% |  | 0.57-0.65%
Expected dividend yield |  | none |  | none |  | none
Restricted Stock Activity | The following table summarizes restricted stock activity during the three year period ended December 31, 2015:
Unvested Restricted Shares |  | Shares |  |  | Weighted- Average Grant-Date Fair Value |
Nonvested at December 31, 2012 |  |  | 162,258 |  |  | $ | 13.23 |
Granted |  |  | 183,967 |  |  |  | 18.78 |
Vested |  |  | (102,258 | ) |  |  | 13.59 |
Forfeited |  |  | — |  |  |  | — |
Outstanding at December 31, 2013 |  |  | 243,967 |  |  | $ | 17.43 |
Granted |  |  | 104,584 |  |  |  | 27.79 |
Vested |  |  | (129,092 | ) |  |  | 16.45 |
Forfeited |  |  | (42,375 | ) |  |  | 19.77 |
Outstanding at December 31, 2014 |  |  | 177,084 |  |  | $ | 23.70 |
Granted |  |  | 108,026 |  |  |  | 44.01 |
Vested |  |  | (82,084 | ) |  |  | 23.86 |
Forfeited |  |  | (24,000 | ) |  |  | 30.87 |
Outstanding at December 31, 2015 |  |  | 179,026 |  |  | $ | 34.92 |
SARs Activity | The following table summarizes SARs activity during the three year period ended December 31, 2015:
Stock Appreciation Rights |  | Units |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2013 |  |  | 495,000 |  |  | $ | 19.19 |  |  |  |  |  |  |  |  |
Granted |  |  | 754,000 |  |  |  | 34.70 |  |  |  |  |  |  |  |  |
Exercised |  |  | (68,750 | ) |  |  | 19.10 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (120,000 | ) |  |  | 21.46 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2014 |  |  | 1,060,250 |  |  | $ | 29.97 |  |  |  | 6.11 |  |  | $ | 9,991 |
Granted |  |  | 259,600 |  |  |  | 43.97 |  |  |  |  |  |  |  |  |
Exercised |  |  | (167,500 | ) |  |  | 23.90 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (102,500 | ) |  |  | 27.82 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 1,049,850 |  |  | $ | 34.61 |  |  |  | 5.46 |  |  | $ | 13,425 |
Exercisable at December 31, 2014 |  |  | 35,000 |  |  | $ | 19.43 |  |  |  | 5.53 |  |  | $ | 602 |
Exercisable at December 31, 2015 |  |  | 153,575 |  |  | $ | 38.12 |  |  |  | 5.59 |  |  | $ | 1,425 |

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