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Employee and Non-Employee Benefit Plans (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($) plan shares | Jun. 30, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of active equity-based compensation plans | plan | 2 |
The 2014 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares approved (in shares) | 1,500,000 |
The Directors' Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares approved (in shares) | 300,000 |
Short-term Incentive Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
EDC, investments | $ | $ 1,257 |
STI Plan deferrals expensed | $ | 1,755 |
Short-term Incentive Plan | Accrued expenses |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
STI Plan deferrals expensed | $ | 180 |
Short-term Incentive Plan | Noncurrent liabilities |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
STI Plan deferrals expensed | $ | $ 1,575 |
Restricted Stock Units (RSUs), granted |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
RSUs outstanding (in shares) | 118,775 |
Participating securities (in shares) | 112,865 | 338,375
Restricted Stock Units (RSUs), granted | The 2014 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grants in period (in shares) | 344,555 |
Restricted Stock Units (RSUs), granted | The Directors' Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Grants in period (in shares) | 81,558 |

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- Definition Amount of expense recognized from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments), awarded to key employees or individuals. Excludes amount related to plans that cover generally all employees (for example, but not limited to, qualified pension plans). + References No definition available. + Details
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- Definition This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 61A -URI http://asc.fasb.org/extlink&oid=117326831&loc=SL5780137-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=117326831&loc=SL5780133-109256 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 68B -URI http://asc.fasb.org/extlink&oid=117326831&loc=SL5498026-109256 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 59A -URI http://asc.fasb.org/extlink&oid=117326831&loc=SL5780131-109256 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=117326831&loc=SL5780132-109256 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + 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)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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