Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Trade Accounts receivable, allowances	$ 5,485	$ 5,095
Common Stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	400,000,000	400,000,000
Common Stock shares issued	175,112,496	175,112,496
Common Stock, shares outstanding	110,780,464	110,429,596
Treasury stock, shares	64,332,032	64,682,900