v2.4.0.8

Stock-based Compensation (Details) (USD $) | 0 Months Ended | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 03, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 2006 Equity Compensation Plan | Dec. 03, 2012 2006 Equity Compensation Plan | Dec. 02, 2012 2006 Equity Compensation Plan | Dec. 31, 2013 2006 Equity Compensation Plan Maximum | Dec. 31, 2013 2006 Equity Compensation Plan Minimum | Dec. 31, 2013 Stock Options | Dec. 31, 2012 Stock Options | Dec. 31, 2011 Stock Options | Dec. 31, 2013 Restricted Stock | Dec. 31, 2012 Restricted Stock | Dec. 31, 2011 Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock available under the plan (in shares) |  |  |  |  |  | 5,400,000 | 3,000,000 |  |  |  |  |  |  |  |
Maximum term of award granted (in years) |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Vesting period of restricted stock, (in years) |  |  |  |  |  |  |  | 5 years | 1 year |  |  |  |  |  |
Stock split | three-for-one |  |  |  | three-for-one |  |  |  |  |  |  |  |  |  |
Weighted average fair value of options granted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 11.54 | $ 9.13 | $ 6.58 |  |  |
Weighted average assumptions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  |  |  |  |  |  |  |  | 3 years 1 month 6 days | 3 years | 3 years |  |  |
Expected volatility (in hundredths) |  |  |  |  |  |  |  |  |  | 39.00% | 46.00% | 54.00% |  |  |
Risk-free interest rate (in hundredths) |  |  |  |  |  |  |  |  |  | 0.50% | 0.30% | 1.40% |  |  |
Expected dividend yield (in hundredths) |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00% |  |  |
Summary of option activity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (in shares) |  |  |  |  |  |  |  |  |  | 438,693 |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  | 55,000 |  |  |  |  |
Exercised (in shares) |  |  |  |  |  |  |  |  |  | (229,506) |  |  |  |  |
Outstanding at end of period (in shares) |  |  |  |  |  |  |  |  |  | 264,187 | 438,693 |  |  |  |
Exercisable at end of period (in shares) |  |  |  |  |  |  |  |  |  | 254,187 |  |  |  |  |
Weighted average exercise price [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price of options outstanding at beginning of period (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 10.72 |  |  |  |  |
Weighted average exercise price of options granted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 41.93 |  |  |  |  |
Weighted average exercise price of options exercised (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 7.62 |  |  |  |  |
Weighted average exercise price of options outstanding at end of period (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 19.90 | $ 10.72 |  |  |  |
Weighted average exercise price of options exercisable at end of period (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 18.94 |  |  |  |  |
Weighted Average Remaining Contractual Life Abstract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average remaining contractual life of options outstanding at end of period (in years) |  |  |  |  |  |  |  |  |  | 2 years 1 month 6 days |  |  |  |  |
Weighted-average remaining contractual life of options exercisable at end of period (in years) |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Aggregate intrinsic value [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options outstanding at end of period |  |  |  |  |  |  |  |  |  | $ 10,133,000 |  |  |  |  |
Aggregate intrinsic value of options exercisable at end of period |  |  |  |  |  |  |  |  |  | 9,994,000 |  |  |  |  |
Aggregate intrinsic value of options exercised during the period |  |  |  |  |  |  |  |  |  | 8,300,000 | 9,614,000 | 5,768,000 |  |  |
Summary of restricted stock activity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonvested at beginning of period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 205,650 |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 126,000 |  |
Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | (73,500) |  |
Forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | (21,200) |  |
Nonvested at end of period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 236,950 | 205,650 |
Weighted average grant-date fair value [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant-date fair value of nonvested shares at beginning of period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 27.94 |  |
Weighted average grant-date fair value of shares granted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 46.80 |  |
Weighted average grant-date fair value of shares vested (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 26.70 |  |
Weighted average grant-date fair value of shares forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 37.25 |  |
Weighted average grant-date fair value of nonvested shares at end of period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 37.24 | $ 27.94 |
Total fair value of shares vested during the period |  |  |  |  |  |  |  |  |  |  |  |  | 2,868,000 | 2,644,000 | 255,000
Stock-based compensation costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 3,560,000 | 2,044,000 | 2,889,000 |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost |  | $ 6,606,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Period over which unrecognized compensation cost is expected to be recognized (in years) |  | 2 years 2 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C + Details
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