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Employee Benefits and Share-Based Compensation - Stock Award Plans (Details) |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Mar. 03, 2015 shares | Mar. 20, 2014 shares | Dec. 16, 2010 shares | Oct. 01, 2010 | May. 19, 2009 shares | Dec. 31, 2014 Day | Feb. 28, 2014 Day | Dec. 31, 2015 mo shares | Dec. 31, 2014 shares | Dec. 31, 2013 shares | Dec. 31, 2012 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction to share available for issuance (in per share) |  |  | 2.15 |  |  |  |  |  |  |  |
Increase to shares authorized |  |  |  |  | 2,600,000 |  |  |  |  |  |
Shares reserved for future issuance |  |  |  |  |  |  |  | 10,342,000 |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares reserved for future issuance |  |  |  |  |  |  |  | 2,688,000 |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares reserved for future issuance |  |  |  |  |  |  |  | 3,804,000 |  |  |
Period used to calculate annual rates of return |  |  |  |  |  |  |  | 1 year |  |  |
Trading days | Day |  |  |  |  |  | 20 | 20 |  |  |  |
Performance Shares | Vesting years subsequent the date of grant |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 3 years |  |  |
Employee Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares reserved for future issuance |  |  |  |  |  |  |  | 3,251,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum |  |  |  |  |  |  |  | 0.79% | 0.53% | 0.85% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum |  |  |  |  |  |  |  | 25.70% | 29.50% | 29.50% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum |  |  |  |  |  |  |  | 37.50% | 42.10% | 44.80% |
2009 Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares authorized for issuance |  |  | 2,600,000.0 |  |  |  |  |  |  |  |
Reduction to share available for issuance (in per share) |  |  | 1.8 | 1.4 |  |  |  | 1 |  |  |
Increase to shares authorized |  |  |  |  |  |  |  | 3,200,000 |  | 2,500,000 |
Shares reserved for future issuance |  |  |  |  |  |  |  | 3,800,000 |  |  |
2009 Plan | Vesting one year from the vesting commencement date |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of award vesting |  |  |  |  |  |  |  | 25.00% |  |  |
2009 Plan | Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 4 years |  |  |
2009 Plan | Employee Stock Option | Vesting one year from the vesting commencement date |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year |  |  |
2009 Plan | Employee Stock Option | Vesting in equal monthly installments |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Monthly vesting installments | mo |  |  |  |  |  |  |  | 36 |  |  |
2009 Plan | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 4 years |  |  |
Shares granted |  |  |  |  |  |  |  | 256,000 |  |  |
Vested |  |  |  |  |  |  |  | 196,000 |  |  |
2009 Plan | Performance Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares granted |  |  |  |  |  |  |  | 60,000 |  |  |
Vested |  |  |  |  |  |  |  | 107,000 |  |  |
2013 Performance Based Restricted Stock Units | Performance Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Awards eligible for vesting |  | 137,500 |  |  |  |  |  |  |  |  |
Percentile rank of stockholder return |  | 63.90% |  |  |  |  |  |  |  |  |
Percentage of shares eligible for time-based vesting |  | 100.00% |  |  |  |  |  |  |  |  |
2013 Performance Based Restricted Stock Units | Performance Shares | Vested immediately |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Awards eligible for vesting |  |  |  |  |  |  |  | 137,500 |  |  |
Vested |  |  |  |  |  |  |  | 34,380 | 68,750 |  |
Percentage of award vesting |  | 25.00% |  |  |  |  |  |  |  |  |
2014 Performance Based Restricted Stock Units | Performance Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Awards eligible for vesting | 132,500 |  |  |  |  |  |  |  |  |  |
Percentile rank of stockholder return | 74.40% |  |  |  |  |  |  |  |  |  |
2014 Performance Based Restricted Stock Units | Performance Shares | Vested immediately |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vested |  |  |  |  |  |  |  | 66,250 |  |  |
Officer | Performance Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares granted |  |  |  |  |  |  |  | 60,000 | 132,500 | 137,500 | 125,000
Awards eligible for vesting |  |  |  |  |  |  |  |  |  |  | 62,500

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Trading Days Number of trading days used to calculate the average closing price of common stock. + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -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 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 estimated measure of the maximum 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 No definition available. + Details
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- Definition The estimated measure of the minimum 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 No definition available. + 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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