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Stock Incentive Plans - Fair Value Valuation Assumptions (Details) - Performance Stock Units - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value at Grant Date (in dollars per share)	$ 9.82	$ 11.04	$ 8.54
February 26, 2016 Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	24.30%
Risk-Free Rate	0.93%
Fair Value at Grant Date (in dollars per share)	$ 8.42
February 26, 2017 Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	26.70%
Risk-Free Rate	1.46%
Fair Value at Grant Date (in dollars per share)	$ 10.89
March 2, 2018 Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	26.90%
Risk-Free Rate	2.40%
Fair Value at Grant Date (in dollars per share)	$ 9.52
April 2, 2018 Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	26.90%
Risk-Free Rate	2.37%
Fair Value at Grant Date (in dollars per share)	$ 9.00

X

- 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

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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