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Employee Benefits and Share-Based Compensation - Stock Award Plans (Details) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Mar. 07, 2016 shares | Mar. 03, 2015 shares | Mar. 20, 2014 | Dec. 16, 2010 shares | Oct. 01, 2010 | May 19, 2009 shares | Dec. 31, 2014 Day | Dec. 31, 2013 shares | Dec. 31, 2016 mo shares | Dec. 31, 2015 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 (in shares) |  |  |  |  |  | 2,600,000 |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  |  |  |  |  | 9,907,000 |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Period used to calculate annual rates of return |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Trading days | Day |  |  |  |  |  |  | 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 |  |  |  |
Awards eligible for vesting (in shares) | 60,000 |  |  |  |  |  |  |  |  |  |  |  |
Awards vested by period end (in shares) |  |  |  |  |  |  |  |  | 30,000 |  |  |  |
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 (in shares) |  |  |  |  |  |  |  |  | 3,200,000 |  |  | 2,500,000 |
Shares reserved for future issuance (in shares) |  |  |  |  |  |  |  |  | 7,076,000 |  |  |  |
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 |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  |  |  |  |  | 3,214,000 |  |  |  |
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 reserved for future issuance (in shares) |  |  |  |  |  |  |  |  | 719,000 |  |  |  |
Shares granted (in shares) |  |  |  |  |  |  |  |  | 289,000 |  |  |  |
Vested (in shares) |  |  |  |  |  |  |  |  | 179,000 |  |  |  |
2009 Plan | Performance Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  |  |  |  |  |  | 123,000 |  |  |  |
Vested (in shares) |  |  |  |  |  |  |  |  | 90,000 |  |  |  |
2013 Performance Based Restricted Stock Units | Performance Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
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 (in shares) |  | 132,500 |  |  |  |  |  |  |  |  |  |  |
Awards vested by period end (in shares) |  |  |  |  |  |  |  |  | 93,000 |  |  |  |
Percentile rank of stockholder return | 66.00% | 74.40% |  |  |  |  |  |  |  |  |  |  |
Officer | Performance Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  |  |  |  |  | 137,500 | 122,740 | 60,000 | 132,500 |  | 125,000
Awards eligible for vesting (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 62,500

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