CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 34,149	$ 59,424
Allowance for credit losses, current	4,318	4,179
Allowance for credit losses, noncurrent	$ 12,461	$ 15,305
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Common stock, shares issued (in shares)	95,065,638	95,065,638
Common stock, shares outstanding (in shares)	55,609,226	55,535,554
Treasury stock, shares (in shares)	39,456,412	39,530,084