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Stock-Based Compensation (Details) (USD $) | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 Restricted Stock Awards | Sep. 30, 2013 Restricted Stock Awards | Mar. 31, 2013 Restricted Stock Awards Awarded in 2009 and 2010 | Sep. 30, 2013 Stock options | Sep. 30, 2013 Stock options | Dec. 31, 2009 Stock options | Mar. 31, 2013 Stock options Awarded in 2009 | Sep. 30, 2013 Stock options Awarded in 2009 item | Sep. 30, 2013 Plan
Share-Based Compensation |  |  |  |  |  |  |  |  |
Number of shares authorized for grant |  |  |  |  |  |  |  |  | 6,900,000
Number of shares of common stock exchanged for each award |  | 1 |  |  |  |  |  |  |
Aggregate number of shares approved | 5,033,333 | 5,033,333 |  | 2,410,465 | 2,410,465 |  |  |  |
Number of restricted stock units for which performance targets established (in shares) |  |  | 178,335 |  |  |  |  |  |
Compensation expense | $ 1,500,000 | $ 5,000,000 |  | $ 500,000 | $ 1,600,000 |  |  |  |
Unrecognized compensation cost related to the unvested awards | 2,700,000 | 2,700,000 |  | 900,000 | 900,000 |  |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized |  | 2 years 1 month 6 days |  |  | 2 years |  |  |  |
Number of Shares |  |  |  |  |  |  |  |  |
Granted and unvested, beginning of period (in shares) |  | 1,141,666 |  |  |  |  |  |  |
Vested (in shares) |  | (514,999) |  |  |  |  |  |  |
Granted (in shares) |  | 196,668 |  |  |  |  |  |  |
Forfeited (in shares) |  | (66,667) |  |  |  |  |  |  |
Total granted and unvested (in shares) | 756,668 | 756,668 |  |  |  |  |  |  |
Approved for grant (in shares) | 852,500 | 852,500 |  |  |  |  |  |  |
Total awarded and unvested, end of period (in shares) | 1,609,168 | 1,609,168 |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |
Total Granted and Unvested, beginning of period, weighted average grant date fair value (in dollars per share) |  | $ 18.12 |  |  |  |  |  |  |
Vested, weighted average grant date fair value (in dollars per share) |  | $ 20.72 |  |  |  |  |  |  |
Granted, weighted average grant date fair value (in dollars per share) |  | $ 19.27 |  |  |  |  |  |  |
Forfeited, weighted average grant date fair value (in dollars per share) |  | $ 14.23 |  |  |  |  |  |  |
Total Granted and Unvested, end of period, weighted average grant date fair value (in dollars per share) | $ 16.99 | $ 16.99 |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |
Total Granted and Unvested, beginning of period, aggregate intrinsic value |  | 15,641,000 |  |  |  |  |  |  |
Vested, aggregate intrinsic value |  | 9,560,000 |  |  |  |  |  |  |
Granted, aggregate intrinsic value |  | 4,193,000 |  |  |  |  |  |  |
Total Granted and Unvested, aggregate intrinsic value | 16,132,000 | 16,132,000 |  |  |  |  |  |  |
Approved for grant, aggregate intrinsic value | 18,175,000 | 18,175,000 |  |  |  |  |  |  |
Total Awarded and Unvested, end of period, aggregate intrinsic value | 34,307,000 | 34,307,000 |  |  |  |  |  |  |
Vesting schedule of outstanding unvested restricted stock awards |  |  |  |  |  |  |  |  |
2013 (in shares) | 185,000 | 185,000 |  |  |  |  |  |  |
2014 (in shares) | 546,668 | 546,668 |  |  |  |  |  |  |
2015 (in shares) | 187,500 | 187,500 |  |  |  |  |  |  |
2016 (in shares) | 202,500 | 202,500 |  |  |  |  |  |  |
2017 (in shares) | 442,500 | 442,500 |  |  |  |  |  |  |
2018 (in shares) | 36,000 | 36,000 |  |  |  |  |  |  |
2019 (in shares) | 9,000 | 9,000 |  |  |  |  |  |  |
Total (in shares) | 1,609,168 | 1,609,168 |  |  |  |  |  |  |
Number of unvested stock awards that will vest subject to the satisfaction of service-based requirements (in shares) |  | 160,000 |  |  |  |  |  |  |
Number of unvested stock awards that will vest subject to the satisfaction of service-based requirements and the achievement of performance metrics (in shares) |  | 1,449,168 |  |  |  |  |  |  |
Term of Stock Options |  |  |  |  | 10 years |  |  |  |
Number of stock option awards subject to achievement of pre-tax income performance targets (in shares) |  |  |  |  |  | 750,000 | 150,000 |  |
Number of Shares |  |  |  |  |  |  |  |  |
Total Granted and Outstanding, beginning of period (in shares) |  |  |  |  | 1,315,465 |  |  |  |
Granted (in shares) |  |  |  |  | 150,000 |  |  |  |
Exercised (in shares) |  |  |  |  | (40,465) |  |  |  |
Forfeited (in shares) |  |  |  |  | (50,000) |  |  |  |
Total granted and outstanding (in shares) |  |  |  | 1,375,000 | 1,375,000 |  |  |  |
Approved for grant (in shares) |  |  |  | 725,000 | 725,000 |  |  |  |
Total Awarded and Unvested, end of period (in shares) |  |  |  | 2,100,000 | 2,100,000 |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |
Total Granted and Outstanding, beginning of period, grant date value (in dollars per share) |  |  |  |  | $ 9.72 |  |  |  |
Granted, grant date value (in dollars per share) |  |  |  |  | $ 6.93 |  |  |  |
Exercised, grant date value (in dollars per share) |  |  |  |  | $ 6.18 |  |  |  |
Forfeited, grant date value (in dollars per share) |  |  |  |  | $ 7.25 |  |  |  |
Total Granted and Outstanding, end of period, grant date value (in dollars per share) |  |  |  | $ 9.61 | $ 9.61 |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |
Total granted and outstanding, beginning of period, weighted average exercise price (in dollars per share) |  |  |  |  | $ 18.91 |  |  |  |
Granted, weighted average exercise price (in dollars per share) |  |  |  |  | $ 20.33 |  |  |  |
Exercised, weighted average exercise price (in dollars per share) |  |  |  |  | $ 13.77 |  |  |  |
Total Granted and Outstanding, weighted average exercise price (in dollars per share) |  |  |  | $ 19.45 | $ 19.45 |  |  |  |
Approved for grant, weighted average exercise price (in dollars per share) |  |  |  | $ 11.61 | $ 11.61 |  |  |  |
Total Awarded and Outstanding, end of period, weighted average exercise price (in dollars per share) |  |  |  | $ 16.75 | $ 16.75 |  |  |  |
Number of vested and exercisable stock options (in shares) |  |  |  | 860,000 | 860,000 |  |  |  |
Vested and exercisable stock options, weighted average exercise price (in dollars per share) |  |  |  | $ 22.10 | $ 22.10 |  |  |  |
Number of unvested stock option awards that will vest subject to the satisfaction of service-based requirements (in shares) |  |  |  | 282,500 | 282,500 |  |  |  |
Number of unvested stock option awards that will vest subject to the satisfaction of service-based requirements and the achievement of performance metrics (in shares) |  |  |  | 957,500 | 957,500 |  |  |  |
Intrinsic value of outstanding stock options |  |  |  | $ 3,800,000 | $ 3,800,000 |  |  |  |
Weighted average remaining contractual term of outstanding stock options |  |  |  |  | 5 years 9 months 18 days |  |  |  |
Number of installments for vesting of stock awards |  |  |  |  |  |  |  | 5 |
Key assumptions used in estimating the grant date fair values of stock option awards granted |  |  |  |  |  |  |  |  |
Risk-free interest rate (as a percent) |  |  |  |  |  |  |  | 0.48% |
Expected life of options |  |  |  |  |  |  |  | 3 years 7 months 6 days |
Expected volatility of underlying stock (as a percent) |  |  |  |  |  |  |  | 51.00% |
Expected quarterly dividends (as a percent) |  |  |  |  |  |  |  | 0.00% |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -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 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 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 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 The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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 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 Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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