Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of Foreign Currency Gains and Losses

Foreign currency (gains) losses for the periods presented were as follows:

	Years Ended December 31,
(In thousands)	2017			2016			2015
(Gain) loss on foreign currency related to re-measurement of U.S. dollar denominated debt held in Canada	$	(30,912	)	$	(14,771	)	$	81,608
(Gain) loss on other transactions	$	1,826		$	115		$	(592	)
(Gain) loss on foreign currency	$	(29,086	)	$	(14,656	)	$	81,016

Property, Plant and Equipment. Weighted Average Useful Lives

The estimated useful lives of the assets are as follows:

Land improvements	Approximately		25 years
Buildings	25 years	-	40 years
Rides	Approximately		20 years
Equipment	3 years	-	10 years

Schedule of Weighted Average Number of Units

The unit amounts used in calculating the basic and diluted earnings per limited partner unit for the years ended December 31, 2017, 2016 and 2015 are as follows:

	Years Ended December 31,
	2017		2016		2015
	(In thousands, except per unit amounts)
Basic weighted average units outstanding	56,061		55,933		55,745
Effect of dilutive units:
Deferred units (Note 7)	42		31		23
Performance units (Note 7)	188		181		72
Restricted units (Note 7)	324		288		358
Unit options (Note 7)	185		129		141
Phantom units (Note 7)	—		—		23
Diluted weighted average units outstanding	56,800		56,562		56,362
Net income per unit - basic	$	3.84	$	3.18	$	2.01
Net income per unit - diluted	$	3.79	$	3.14	$	1.99