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Shareholders' Equity and Long-Term Incentive Compensation - Stock Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions				12 Months Ended
	Feb. 22, 2018	Mar. 01, 2017	Mar. 02, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock Options
Historical period upon which annual expected stock price volatility is based				3 years
Maximum
Stock Options
Daily treasury yield curve period upon which average risk-free interest rate is based				3 years
Minimum
Stock Options
Daily treasury yield curve period upon which average risk-free interest rate is based				1 year
PSU's, RSU's, and RS's
Unvested Restricted Stock Shares and Restricted Stock Units
Outstanding at the beginning of the period (in shares)				1,230	1,702	1,869
Granted (in shares)				211	252	423
Vested (in shares)				(753)	(483)	(528)
Forfeited (in shares)				(36)	(241)	(62)
Outstanding at the end of the period (in shares)				652	1,230	1,702
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)				$ 17.41	$ 16.47	$ 17.63
Granted (in dollars per share)				33.69	28.22	13.97
Vested (in dollars per share)				15.39	18.17	10.32
Forfeited (in dollars per share)				22.35	20.83	20.46
Outstanding at the end of the period (in dollars per share)				$ 24.65	$ 17.41	$ 16.47
Unrecognized compensation cost
Unrecognized compensation cost related to restricted stock share and restricted stock unit				$ 5.7
PSU's, RSU's, and RS's | Weighted Average
Unrecognized compensation cost
Weighted-average period over which unrecognized compensation costs will be recognized				1 year 8 months 12 days
PSU's, RSU's, and RS's | Maximum
Stock Options
Vesting period				3 years
PSU's, RSU's, and RS's | Minimum
Stock Options
Vesting period				1 year
Stock options
Unrecognized compensation cost
Compensation costs not yet recognized				$ 1.4
Stock Options
Granted (in shares)	184	208	505	184	208	505
Number of stock options exercisable (in shares)				1,242
Exercise price per share (in dollars per share)	$ 32.69	$ 27.40	$ 12.85	$ 32.69	$ 27.40	$ 12.85
Fair value of stock option grants (in dollars per share)	$ 11.66	$ 9.60	$ 4.11
Annual expected stock price volatility	31.14%	32.00%	30.06%
Annual expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	2.75%	2.14%	1.50%
Expected life of stock option (in years)	6 years	6 years	6 years
Historical period upon which annual expected stock price volatility is based	6 years
Vesting period	3 years
Stock option activity, Shares
Options outstanding and exercisable at the beginning of the period (in shares)				1,608	1,552	1,047
Exercised (in shares)				(64)	(125)
Forfeitures (in shares)				(10)	(27)
Granted (in shares)	184	208	505	184	208	505
Options outstanding and exercisable at the end of the period (in shares)				1,718	1,608	1,552
Stock option activity, Weighted Average Exercise Price
Options outstanding and exercisable, beginning balance (in dollars per share)				$ 14.67	$ 12.89	$ 12.91
Exercised, Weighted Average Grant Date Fair Value (in dollars per share)				13.89	20.67
Forfeitures in Period, Weighted Average Exercise Price (in dollars per share)				23.17	14.45
Granted, Weighted Average Exercise Price (in dollars per share)	$ 32.69	$ 27.40	$ 12.85	32.69	27.40	12.85
Options outstanding and exercisable, ending balance (in dollars per share)				$ 16.58	$ 14.67	$ 12.89
Stock options | Weighted Average
Unrecognized compensation cost
Weighted-average period over which unrecognized compensation costs will be recognized				1 year 10 months 24 days
Stock options | Maximum
Stock Options
Maximum contractual term				10 years
Daily treasury yield curve period upon which average risk-free interest rate is based	7 years
Stock options | Minimum
Stock Options
Daily treasury yield curve period upon which average risk-free interest rate is based	5 years

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The historical period upon which annual expected stock price volatility is based.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Gross number of share options (or share units) granted during the period.

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