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Stock-Based Compensation Plans - Activity for Awards Made Outside of Share-Based Compensation Plans (Details) - ELTI Plan, the 2013 New Company LTIP, the 2007 Incentive Plan and awards made outside of stock-based compensation plans - $ / shares shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Number of Shares/Units |  |  |
Shares outstanding, beginning of period (in shares) | 440 | 590 | 855
Shares, granted (in shares) | 449 | 238 | 247
Shares, adjustments (in shares) | 70 | 45 |
Shares, vested (in shares) | (346) | (430) | (501)
Shares cancelled/forfeited (in shares) | (17) | (3) | (11)
Shares outstanding, end of period (in shares) | 596 | 440 | 590
Weighted Average Grant Date Fair Value |  |  |
Shares outstanding, weighted average grant date fair value, beginning of period (in dollars per share) | $ 47.23 | $ 37.23 | $ 27.90
Shares, weighted average grant date fair value, granted (in dollars per share) | 75.39 | 53.25 | 45.24
Shares, weighted average grant date fair value, adjustments (in dollars per share) | 47.01 | 51.00 |
Shares, weighted average grant date fair value, vested (in dollars per share) | 46.60 | 39.98 | 22.54
Shares, weighted average grant date fair value, cancelled/forfeited (in dollars per share) | 54.49 | 41.92 | 29.64
Shares outstanding, weighted average grant date fair value, end of period (in dollars per share) | $ 68.66 | $ 47.23 | $ 37.23
Market Condition & Performance-Based Awards |  |  |
Number of Shares/Units |  |  |
Shares outstanding, beginning of period (in shares) | 124 | 110 | 51
Shares, granted (in shares) | 256 | 65 | 59
Shares, adjustments (in shares) | 70 | 45 |
Shares, vested (in shares) | (129) | (96) | 0
Shares cancelled/forfeited (in shares) | 0 | 0 | 0
Shares outstanding, end of period (in shares) | 321 | 124 | 110
Weighted Average Grant Date Fair Value |  |  |
Shares outstanding, weighted average grant date fair value, beginning of period (in dollars per share) | $ 51.59 | $ 48.86 | $ 51.00
Shares, weighted average grant date fair value, granted (in dollars per share) | 68.32 | 55.75 | 47.01
Shares, weighted average grant date fair value, adjustments (in dollars per share) | 47.01 | 51.00 |
Shares, weighted average grant date fair value, vested (in dollars per share) | 47.01 | 51.00 | 0.00
Shares, weighted average grant date fair value, cancelled/forfeited (in dollars per share) | 0.00 | 0.00 | 0.00
Shares outstanding, weighted average grant date fair value, end of period (in dollars per share) | $ 65.77 | $ 51.59 | $ 48.86
Service Period Awards |  |  |
Number of Shares/Units |  |  |
Shares outstanding, beginning of period (in shares) | 316 | 480 | 804
Shares, granted (in shares) | 193 | 173 | 188
Shares, adjustments (in shares) | 0 | 0 |
Shares, vested (in shares) | (217) | (334) | (501)
Shares cancelled/forfeited (in shares) | (17) | (3) | (11)
Shares outstanding, end of period (in shares) | 275 | 316 | 480
Weighted Average Grant Date Fair Value |  |  |
Shares outstanding, weighted average grant date fair value, beginning of period (in dollars per share) | $ 45.51 | $ 36.90 | $ 23.99
Shares, weighted average grant date fair value, granted (in dollars per share) | 84.78 | 52.31 | 44.68
Shares, weighted average grant date fair value, adjustments (in dollars per share) | 0.00 | 0.00 |
Shares, weighted average grant date fair value, vested (in dollars per share) | 46.35 | 36.79 | 22.54
Shares, weighted average grant date fair value, cancelled/forfeited (in dollars per share) | 54.49 | 41.92 | 29.64
Shares outstanding, weighted average grant date fair value, end of period (in dollars per share) | $ 72.03 | $ 45.51 | $ 36.90

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- Definition Share-based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Adjustments In Period, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Share-based Compensation Arrangements By Share-based Payment Award, Equity Instruments Other Than Options, Adjustments + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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://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=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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=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 weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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