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Capital Stock (Narrative) (Details) $ in Thousands		3 Months Ended
	Dec. 08, 2016 USD ($) installment	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Mar. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of annual installments | installment	3
Annual installment payment, equity or cash, amount | $	$ 16,670
Value of agreement | $	$ 50,000
Class A Voting Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized common shares (in shares) | shares		500,000,000		500,000,000
Annual installment payment, equity or cash, amount | $		$ 8,300	$ 8,300
Affiliation agreement, annual installment payment, shares issued | shares		431,332	266,667
Class B Non-Voting Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized common shares (in shares) | shares		500,000,000		500,000,000
Annual installment payment, equity or cash, amount | $		$ 8,300	$ 8,300
Affiliation agreement, annual installment payment, shares issued | shares		467,902	278,334

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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