CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	20,000,000	20,000,000
Preferred Stock, Shares Outstanding	0	0
Current assets
Allowance for doubtful accounts	$ 853	$ 647
Stockholders equity
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	240,000,000	240,000,000
Common stock, shares issued	70,809,000	69,508,000
Common stock, shares outstanding	54,077,000	53,918,000
Treasury Stock, Shares	16,732,000	15,591,000