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Stock appreciation rights (SARs) (Details Textual) - shares
3 Months Ended
Mar. 07, 2019
Apr. 04, 2018
Jan. 15, 2016
Mar. 06, 2015
Sep. 01, 2014
Mar. 12, 2014
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 560,000            
New Stock Appreciation Rights [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   1,719,733          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   7 years          
Stock Appreciation Rights (SARs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 560,000 1,719,733 205,519 37,797 5,595 22,118  
Percentage Of Exercise Price Per Share Appreciation Limit Under Condition One             400.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   1,078,125          
Equity Incentive Plan 2013 [Member] | Officers And Directors [Member] | Stock Appreciation Rights (SARs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period             2,550,762
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period             5,779