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Stock Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		9 Months Ended
	Apr. 02, 2018	Mar. 02, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period (in years)					3 years
Percentage of target award of maximum possible payout to executives					150.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)					3 years
Awards expected to vest in 2019 (in shares)			310,117		310,117
Awards expected to vest in 2020 (in shares)			215,368		215,368
Awards expected to vest in 2021 (in shares)			116,359		116,359
Unrecognized compensation cost			$ 4.8		$ 4.8
Unrecognized compensation expense related to compensation awards, period for recognition (in months)					23 months
Compensation expense			0.2	$ 0.8	$ 2.3	$ 2.3
Number of shares, granted (in shares)					349,091
Restricted Stock | Chief Financial Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated compensation cost					$ 0.6
Reversal of accelerated compensation cost			$ 0.5
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)					3 years
Awards expected to vest in 2019 (in shares)			245,055		245,055
Awards expected to vest in 2020 (in shares)			228,521		228,521
Awards expected to vest in 2021 (in shares)			299,218		299,218
Unrecognized compensation cost			$ 3.7		$ 3.7
Unrecognized compensation expense related to compensation awards, period for recognition (in months)					24 months
Compensation expense			(0.4)	$ 0.6	$ 1.3	$ 1.8
Percentage of total stockholder return for payout of shares					30.00%
Number of shares, granted (in shares)					293,111
Fair value at grant date (in dollars per share)	$ 9.00	$ 9.52
Volatility	26.90%	26.90%
Risk-free rate	2.37%	2.40%
Fair value at grant date based on hotel market share (in dollars per share)	$ 10.32	$ 10.18
Performance Stock Units | Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of total stockholder return for payout of shares					75.00%
Number of shares, granted (in shares)		264,509
Performance Stock Units | Chief Financial Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			$ (1.0)		$ (0.4)
Number of shares, granted (in shares)	28,602
2016 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option and incentive plan, shares authorized (up to) (in shares)			6,082,664		6,082,664
Number of shares issued or committed to issue (in shares)			846,517		846,517
Issued In 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period (in years)					3 years
Issued In 2016 | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)					3 years
Percentage of payout based on improving market share					25.00%
Issued In 2016 | Performance Stock Units | Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of total stockholder return for payout of shares					75.00%
Issued In 2017 | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)					3 years
Percentage of payout based on improving market share					50.00%
Issued In 2017 | Performance Stock Units | Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of total stockholder return for payout of shares					50.00%

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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.

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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.

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Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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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).

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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.

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

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