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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts receivable, allowance for doubtful accounts (in dollars) $ 1,879 $ 2,453
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 128,546 123,599
Finite-Lived Intangible Assets, Accumulated Amortization $ 80,934 $ 86,773
Preferred Stock, Shares Authorized 95,000 95,000
Preferred stock, shares issued 95,000 95,000
Preferred Stock, Shares Outstanding 95,000 95,000
Other Intangible Assets    
Finite-Lived Intangible Assets, Accumulated Amortization $ 161,868 $ 173,546