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Stock-Based Compensation - Schedule of Performance Awards (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Employee Performance Share Awards |  |  |
Summary of employee performance share awards activity (in shares) |  |  |
Outstanding at beginning of period (in shares) | 1,095,970 | 993,530 | 925,590
Granted (in shares) | 531,670 | 406,460 | 435,990
Issued and fully vested | (315,970) | (225,780) | (340,960)
Forfeited (in shares) | (31,649) | (78,240) | (27,090)
Outstanding at end of period (in shares) | 1,280,021 | 1,095,970 | 993,530
Weighted-Average Grant Date Fair Value per Share (in usd per share) |  |  |
Outstanding at beginning of period (in USD per share) | $ 23.31 | $ 27.26 | $ 30.23
Granted (in USD per share) | 23.25 | 22.60 | 20.49
Issued and fully vested (in USD per share) | 27.71 | 39.43 | 26.62
Forfeited (in USD per share) | 22.33 | 23.20 | 27.77
Outstanding at end of period (in USD per share) | $ 22.22 | $ 23.31 | $ 27.26
Hybrid Performance Shares |  |  |
Summary of employee performance share awards activity (in shares) |  |  |
Outstanding at beginning of period (in shares) | 574,354 | 479,784 | 372,385
Granted (in shares) | 321,720 | 272,920 | 271,938
Issued and fully vested | (233,686) | (178,350) | (164,539)
Forfeited (in shares) | 0 | 0 | 0
Outstanding at end of period (in shares) | 662,388 | 574,354 | 479,784
Weighted-Average Grant Date Fair Value per Share (in usd per share) |  |  |
Outstanding at beginning of period (in USD per share) | $ 22.72 | $ 25.12 | $ 30.37
Granted (in USD per share) | 23.25 | 22.60 | 20.49
Issued and fully vested (in USD per share) | 24.12 | 29.01 | 29.34
Forfeited (in USD per share) | 0 | 0 | 0
Outstanding at end of period (in USD per share) | $ 22.48 | $ 22.72 | $ 25.12
TSR Performance Share Awards |  |  |
Summary of employee performance share awards activity (in shares) |  |  |
Outstanding at beginning of period (in shares) | 1,109,708 | 885,213 | 732,286
Granted (in shares) | 482,581 | 409,380 | 407,907
Issued and fully vested | (292,421) | (157,147) | (254,980)
Forfeited (in shares) | 0 | (27,738) | 0
Outstanding at end of period (in shares) | 1,299,868 | 1,109,708 | 885,213
Weighted-Average Grant Date Fair Value per Share (in usd per share) |  |  |
Outstanding at beginning of period (in USD per share) | $ 19.23 | $ 21.62 | $ 23.82
Granted (in USD per share) | 19.92 | 19.85 | 18.57
Issued and fully vested (in USD per share) | 19.29 | 32.04 | 23.06
Forfeited (in USD per share) | 0 | 32.04 | 0
Outstanding at end of period (in USD per share) | $ 19.47 | $ 19.23 | $ 21.62

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that issued and fully vested during the reporting period. + References No definition available. + Details
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- Definition The weighted average fair value at grant date for equity-based awards issued and fully vested 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 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 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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