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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2013
Stock-Based Compensation |
Schedule of the stock option activity |
|  | Options |  | Weighted-Average Exercise Price |
Outstanding at January 1, 2013 |  | 1,432,228 |  | $ | 10.34 |
Granted |  | 111,147 |  | $ | 24.68 |
Exercised |  | (299,548 | ) | $ | 5.73 |
Forfeited |  | (3,391 | ) | $ | 20.13 |
Expired |  | (1,280 | ) | $ | 15.45 |
Outstanding at September 30, 2013 |  | 1,239,156 |  | $ | 12.71 |
Schedule of the fair value and assumptions used in determining the fair value of stock options granted |
|  | 2013 |  | 2012 |
Risk-free interest rate |  | 1.0% |  | 1.2 - 1.4% |
Expected dividend yield |  | 0.0% |  | 0.0% |
Weighted average expected volatility |  | 50% |  | 50% |
Expected term |  | 6.0 years |  | 6.0 - 6.3 years |
Weighted average grant date fair value |  | $11.74 |  | $8.57 |
Schedule of restricted stock activity |
|  | Shares |  | Weighted-Average Grant Date Fair Value |
Outstanding at January 1, 2013 |  | 185,764 |  | $ | 19.54 |
Granted |  | 76,590 |  | $ | 24.48 |
Vested |  | (48,513 | ) | $ | 19.50 |
Forfeited |  | (1,764 | ) | $ | 19.80 |
Outstanding at September 30, 2013 |  | 212,077 |  | $ | 21.33 |
Schedule of performance awards activity |
|  | Shares |  | Weighted-Average Grant Date Fair Value |
Outstanding at January 1, 2013 |  | 74,923 |  | $ | 20.51 |
Granted |  | 46,106 |  | $ | 24.68 |
Outstanding at September 30, 2013 |  | 121,029 |  | $ | 22.10 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -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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