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Stock-based Compensation Plans - Schedule of PSU and RSU Plans Activity (Details) - shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Number of Awards |  |
Awards paid out (shares) | (1,041,450) |
Outstanding, end of year (shares) | 2,345,174 |
PSUs |  |
Number of Awards |  |
Outstanding, beginning of year (shares) | 694,386 | 481,700
Granted (shares) | 351,737 | 276,381
Granted - notional dividends reinvested (shares) | 34,439 | 25,687
Awards paid out (shares) | (148,168) | (83,637)
Cancelled/forfeited (shares) | (443) | (5,745)
Outstanding, end of year (shares) | 931,951 | 694,386
PSUs | Senior management |  |
Number of Awards |  |
Awards paid out (shares) | (2,432) |
RSUs |  |
Number of Awards |  |
Outstanding, beginning of year (shares) | 58,740 | 0
Granted (shares) | 70,393 | 59,462
Granted - notional dividends reinvested (shares) | 4,709 | 2,150
Awards paid out (shares) | (10,201) | 0
Cancelled/forfeited (shares) | (29) | (2,872)
Outstanding, end of year (shares) | 123,612 | 58,740

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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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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=6415400&loc=d3e5070-113901 + Details
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