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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
UNAUDITED CONSOLIDATED BALANCE SHEETS    
Allowance for doubtful accounts receivable $ 3,364 $ 1,331
Property and equipment, accumulated depreciation 272,865 253,495
Intangible assets, accumulated amortization $ 10,880 $ 7,031
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 4,000,000 4,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 16,648,616 16,564,961
Common stock, shares outstanding (in shares) 16,648,616 16,564,961