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Equity Based Plans - Summary of Cumulative Summary of Equity Plans (Details) - shares | Dec. 31, 2018 | Mar. 17, 2016 | Mar. 16, 2016
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Share-based Compensation [Abstract] |  |  |
Authorized (in shares) | 2,700,000 |  |
Restricted stock issued (in shares) | 1,346,293 |  |
Outstanding stock options (in shares) | 0 |  |
Stock options exercised (in shares) | 918,091 |  |
Stock options exercisable (in shares) | 0 |  |
Shares available for grant (in shares) | 399,584 |  |
Amended 1999 Plan [Member] |  |  |
Share-based Compensation [Abstract] |  |  |
Authorized (in shares) | 600,000 |  |
Restricted stock issued (in shares) | 416,402 |  |
Outstanding stock options (in shares) | 0 |  |
Stock options exercised (in shares) | 139,791 |  |
Stock options exercisable (in shares) | 0 |  |
Shares available for grant (in shares) | 7,775 |  |
Amended 2003 Plan [Member] |  |  |
Share-based Compensation [Abstract] |  |  |
Authorized (in shares) | 2,100,000 | 2,100,000 | 1,750,000
Restricted stock issued (in shares) | 929,891 |  |
Outstanding stock options (in shares) | 0 |  |
Stock options exercised (in shares) | 778,300 |  |
Stock options exercisable (in shares) | 0 |  |
Shares available for grant (in shares) | 391,809 |  |

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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://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=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 The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of share options (or share units) exercised for the cumulative period. + References No definition available. + Details
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