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Employee Benefits and Share-Based Compensation - Performance-based Restricted Stock Units Activity (Details) - Performance Shares - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 07, 2017 | Feb. 08, 2017 | Mar. 07, 2016 | Feb. 04, 2016 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |
Trading days |  | 20 days |  | 20 days | 20 days |  |  |
2009 Plan |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Nonvested, beginning balance (in shares) |  |  |  |  |  | 184,000 |  |
Granted (Awarded) (in shares) |  |  |  |  |  | 148,000 |  |
Vested (Released) (in shares) |  |  |  |  |  | (107,000) |  |
Nonvested, ending balance (in shares) |  |  |  |  |  | 225,000 | 184,000 |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |
Nonvested, beginning balance (in dollars per share) |  |  |  |  |  | $ 24.89 |  |
Granted (Awarded) (in dollars per share) |  |  |  |  |  | 34.05 | $ 24.66 | $ 29.56
Vested (Released) (in dollars per share) |  |  |  |  |  | 24.36 |  |
Nonvested, ending balance (in dollars per share) |  |  |  |  |  | $ 31.18 | $ 24.89 |
Weighted average period of compensation cost recognized (in years) |  |  |  |  |  | 1 year 2 months 23 days |  |
Unrecognized compensation cost |  |  |  |  |  | $ 2.7 | $ 1.6 |
Vested in period, fair value |  |  |  |  |  | $ 2.6 | $ 2.0 | $ 1.9
2015 Performance Based Restricted Stock Units |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Awards eligible for vesting (in shares) |  |  | 60,000 |  |  |  |  |
Awards vested by period end (in shares) |  |  |  |  |  | 45,000 |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |
Percentile rank of stockholder return |  |  | 66.00% |  |  |  |  |
Percentage of shares eligible for time-based vesting |  |  | 100.00% |  |  |  |  |
Percentage of award vesting |  |  | 25.00% |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 3 years |  |
2016 Performance Based Restricted Stock Units |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Awards eligible for vesting (in shares) | 122,740 |  |  |  |  |  |  |
Awards vested by period end (in shares) |  |  |  |  |  | 61,375 |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |
Percentile rank of stockholder return | 71.50% |  |  |  |  |  |  |
Percentage of shares eligible for time-based vesting | 100.00% |  |  |  |  |  |  |
Percentage of award vesting | 25.00% |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 36 months |  |
Officer |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Granted (Awarded) (in shares) |  |  |  |  |  | 147,830 | 122,740 |

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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 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 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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