CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowances for trade accounts receivable	$ 14,382	$ 11,692
Preferred stock, authorized (in shares)	30,000,000	30,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, authorized (in shares)	300,000,000	300,000,000
Common stock, issued (in shares)	100,198,000	99,829,000
Common stock, outstanding (in shares)	100,198,000	99,829,000