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Share-Based Transactions - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2013 | Dec. 31, 2017 | Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant | 1,700,000 |  |  |  |
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term |  |  | 10 years |  |
Stock options exercise term, description | Upon retirement, employees have the lesser of three years or the remaining option term to exercise any vested options. |  |  |  |
Share-based compensation arrangement by share-based payment award, sale restrictions expiration period subsequent to vesting | 3 years |  |  |  |
Restricted stock units (RSUs) [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized | $ 3,300,000 |  |  |  |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition | 9 months 18 days |  |  |  |
Performance share units (PSUs) [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  | 3 years |  |  |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized | $ 600,000 |  |  |  |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition | 10 months 24 days |  |  |  |
Agent equity awards unvested | 85,000 | 18,000 |  | 54,000 |
Performance share units (PSUs) [Member] | Minimum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Percentage of granted PSUs to be issued based on performance |  | 0.00% |  |  |
Performance share units (PSUs) [Member] | Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Percentage of granted PSUs to be issued based on performance |  | 150.00% |  |  |
Employee Stock Option [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  |  | 3 years |  |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized | $ 6,000 |  |  |  |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition | 1 month 6 days |  |  |  |
Number of stock options issued | $ 0 |  |  |  |
Nonemployee Shares [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Agent equity awards unvested | 34,000 | 42,000 |  | 32,000 | 73,000
Management [Member] | Restricted stock units (RSUs) [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 3 years |  |  |  |
Director | Restricted stock units (RSUs) [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 12 months |  |  |  |

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- Definition Share based compensation arrangement by share based payment award percentage of granted PSUs to be issued based on performance. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award sale restrictions expiration period subsequent to vesting. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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