Summary of Significant Accounting Policies Narrative (Details) - USD ($)		3 Months Ended	12 Months Ended
	Jan. 01, 2018	Mar. 25, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2019
Non-cash foreign currency (gain) loss on debt			$ 37,724,000	$ (30,912,000)	$ (14,771,000)
(Gain) loss on other transactions			(1,470,000)	1,826,000	115,000
(Gain) loss on foreign currency			36,254,000	(29,086,000)	(14,656,000)
Depreciation and amortization			154,900,000	152,500,000	131,200,000
Goodwill, impairment loss			0	0
Impairment of intangible assets			0	0
Self-insurance reserves			24,021,000	25,107,000
Deferred revenue			107,074,000	86,131,000
Deferred revenue percentage, season-long products	88.00%
Allowance for doubtful accounts receivable			2,600,000	2,200,000
Advertising expense			65,500,000	$ 63,900,000	$ 60,800,000
Effective income tax rate reconciliation, share-based compensation, excess tax benefit, Amount		$ 400,000	$ 0
Minimum [Member]
Finite-lived intangible asset, useful life			3 years
Operating cycle, period			130 days
Maximum [Member]
Finite-lived intangible asset, useful life			20 years
Operating cycle, period			140 days
Scenario, Forecast [Member] | Accounting Standards Update 2016-02 [Member] | Minimum [Member]
Operating lease, right-of-use asset						$ 65,000,000
Scenario, Forecast [Member] | Accounting Standards Update 2016-02 [Member] | Maximum [Member]
Operating lease, right-of-use asset						$ 75,000,000