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Subsequent events Subsequent events	3 Months Ended
Subsequent events Subsequent events	Mar. 31, 2018
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Events On April 20, 2018, the Park Board of Directors declared a $0.96 per common share quarterly cash dividend in respect of Park's common shares and a $0.25 per common share special cash dividend in respect of Park's common shares. The dividends are payable on June 8, 2018 to common shareholders of record as of the close of business on May 18, 2018.