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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Dividends Receivable $ 17,582 $ 0
Accounts and other receivables, allowance for doubtful accounts and sales returns $ 3,194 $ 2,937
Common stock, no par value
Common stock, shares issued 33,358,408 33,176,024
Common stock, shares outstanding 33,358,408 33,176,024
Common Stock, Shares Held in Employee Trust, Shares 73,381 72,883