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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Assumptions Used to Estimate Fair Value of Each SAR | The fair value of each stock option award and SAR is estimated on the date of grant using a Black-Scholes option-pricing model. For SARs issued in the years ended December 31, 2013, 2012 and 2011, respectively, the assumptions shown in the following table were used:
|  | Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Average risk-free interest rate |  |  | 0.7 | % |  |  | 0.8 | % |  |  | 2.0 | %
Expected term (years) |  |  | 5 |  |  |  | 5 |  |  |  | 5 |
Volatility |  |  | 63.7 | % |  |  | 65.9 | % |  |  | 65.0 | %
Stock Option Activity | Stock option activity under the Plan and a predecessor stock incentive plan is as follows:
|  | Options |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value as of December 31, 2013 |
Outstanding at December 31, 2010 |  |  | 222,446 |  |  | $ | 33.20 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (57,027 | ) |  | $ | 27.94 |  |  |  |  |  |  |  |  |
Canceled |  |  | (20,350 | ) |  | $ | 31.71 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2011 |  |  | 145,069 |  |  | $ | 38.08 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (23,189 | ) |  | $ | 31.35 |  |  |  |  |  |  |  |  |
Canceled |  |  | (1,242 | ) |  | $ | 20.00 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 120,638 |  |  | $ | 40.37 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (93,484 | ) |  | $ | 49.83 |  |  |  |  |  |  |  |  |
Canceled |  |  | (6,010 | ) |  | $ | 36.31 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 21,144 |  |  | $ | 40.09 |  |  |  | 1.0 |  |  | $ | 833,948 |
Vested at December 31, 2013 |  |  | 21,144 |  |  | $ | 40.09 |  |  |  | 1.0 |  |  | $ | 833,948 |
Exercisable at December 31, 2013 |  |  | 21,144 |  |  | $ | 40.09 |  |  |  | 1.0 |  |  | $ | 833,948 |
SAR Activity | SAR activity under the Plan is as follows:
|  | SARs |  |  | Weighted- Average Grant Price Per Share |  |  | Weighted- Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value as of December 31, 2013 |
Outstanding at December 31, 2010 |  |  | 1,246,495 |  |  | $ | 13.70 |  |  |  |  |  |  |  |  |
Granted |  |  | 96,765 |  |  | $ | 25.76 |  |  |  |  |  |  |  |  |
Exercised |  |  | (180,555 | ) |  | $ | 28.34 |  |  |  |  |  |  |  |  |
Canceled |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2011 |  |  | 1,162,705 |  |  | $ | 13.17 |  |  |  |  |  |  |  |  |
Granted |  |  | 100,914 |  |  | $ | 25.75 |  |  |  |  |  |  |  |  |
Exercised |  |  | (567,953 | ) |  | $ | 13.08 |  |  |  |  |  |  |  |  |
Canceled |  |  | (8,476 | ) |  | $ | 24.15 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 687,190 |  |  | $ | 18.56 |  |  |  |  |  |  |  |  |
Granted |  |  | 60,588 |  |  | $ | 43.89 |  |  |  |  |  |  |  |  |
Exercised |  |  | (374,667 | ) |  | $ | 15.39 |  |  |  |  |  |  |  |  |
Canceled |  |  | (3,514 | ) |  | $ | 26.20 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 369,597 |  |  | $ | 25.85 |  |  |  | 6.9 |  |  | $ | 2,547,706 |
Vested at December 31, 2013 |  |  | 230,604 |  |  | $ | 21.37 |  |  |  | 6.0 |  |  | $ | 1,386,104 |
Exercisable at December 31, 2013 |  |  | 230,604 |  |  | $ | 21.37 |  |  |  | 6.0 |  |  | $ | 1,386,104 |
Restricted Stock Activity | Restricted stock activity under the Plan is as follows:
|  | Restricted Stock |  |  | Weighted-Average Grant Price Per Share |
Nonvested at December 31, 2010 |  |  | 244,436 |  |  | $ | 13.65 |
Granted |  |  | 67,945 |  |  | $ | 25.86 |
Vested |  |  | (151,706 | ) |  | $ | 27.06 |
Forfeited |  |  | (500 | ) |  | $ | 17.41 |
Nonvested at December 31, 2011 |  |  | 160,175 |  |  | $ | 22.99 |
Granted |  |  | 156,927 |  |  | $ | 27.18 |
Vested |  |  | (94,705 | ) |  | $ | 26.88 |
Forfeited |  |  | (7,712 | ) |  | $ | 25.47 |
Nonvested at December 31, 2012 |  |  | 214,685 |  |  | $ | 24.16 |
Granted |  |  | 47,015 |  |  | $ | 44.42 |
Vested |  |  | (69,797 | ) |  | $ | 44.55 |
Forfeited |  |  | (416 | ) |  | $ | 32.32 |
Nonvested at December 31, 2013 |  |  | 191,487 |  |  | $ | 27.56 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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