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Performance Incentive Plan (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized, 2017 plan (in shares) |  |  |  | 1,800,000
Stock options exercisable (in shares) | 0 |  |  |
Stock options outstanding (in shares) | 0 |  |  |
Number of Shares |  |  |  |
Restricted shares granted (in shares) | 35,336 |  |  |
Weighted Average Share Price |  |  |  |
Restricted shares granted (in dollars per share) | $ 40.22 |  |  |
Shares available under the 2017 Plan for grant, end of period (in shares) | 1,733,296 |  |  |
Share-based compensation cost | $ 12,971,000 | $ 10,758,000 | $ 9,671,000 |
Unrecognized compensation cost | $ 10,542,000 |  |  |
Weighted average period for recognition of unrecognized compensation cost (in years) | 2 years 4 months 24 days |  |  |
Restricted stock |  |  |  |
Number of Shares |  |  |  |
Non-vested restricted shares, January 1 (in shares) | 871,718 |  |  |
Restricted shares granted (in shares) | 292,968 |  |  |
Restricted shares vested (in shares) | (410,497) |  |  |
Restricted shares forfeited (in shares) | (11,356) |  |  |
Restricted shares repurchased (in shares) | (7,510) |  |  |
Non-vested restricted shares, December 31 (in shares) | 735,323 | 871,718 |  |
Weighted Average Share Price |  |  |  |
Non-vested restricted shares, January 1 (in dollars per share) | $ 38.88 |  |  |
Restricted shares granted (in dollars per share) | 43.61 |  |  |
Restricted shares vested (in dollars per share) | 35.80 |  |  |
Restricted shares forfeited (in dollars per share) | 33.42 |  |  |
Restricted shares repurchased (in dollars per share) | 30.80 |  |  |
Non-vested restricted shares, December 31 (in dollars per share) | $ 42.65 | $ 38.88 |  |
Restricted stock | Minimum |  |  |  |
Weighted Average Share Price |  |  |  |
Vesting period (in years) | 3 years |  |  |
Restricted stock | Maximum |  |  |  |
Weighted Average Share Price |  |  |  |
Vesting period (in years) | 5 years |  |  |
Performance shares |  |  |  |
Number of Shares |  |  |  |
Restricted shares granted (in shares) | 169,495 | 142,199 |  |
Weighted Average Share Price |  |  |  |
Performance period used In calculation (in years) | 3 years |  |  |
Weighted average grant price, grants to certain executive officers (in USD per share) | $ 25.77 | $ 34.60 |  |
Share-based compensation cost | $ 0 | $ 0 | $ 0 |
Performance shares | Executive officers |  |  |  |
Weighted Average Share Price |  |  |  |
Weighted average grant price, grants to certain executive officers (in USD per share) | $ 43.73 | $ 44.70 |  |
Directors’ fees |  |  |  |
Number of Shares |  |  |  |
Restricted shares granted (in shares) | 14,007 |  |  |
Weighted Average Share Price |  |  |  |
Restricted shares granted (in dollars per share) | $ 40.09 |  |  |
Deferred directors’ fees |  |  |  |
Number of Shares |  |  |  |
Restricted shares granted (in shares) | 21,329 |  |  |
Weighted Average Share Price |  |  |  |
Restricted shares granted (in dollars per share) | $ 40.31 |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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=96867065&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://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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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://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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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