Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 5,412	$ 8,893	$ 13,480
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 603,229	$ 602,660	$ 576,597
Preferred Stock, Shares Authorized	10,000	10,000	10,000
Preferred Stock, Shares Outstanding	0	0	0
Preferred Stock, Shares Issued	0	0	0
Common Stock, Shares Authorized	250,000	250,000
Common Stock, Shares, Issued	62,948	65,164