CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
CONSOLIDATED BALANCE SHEETS
Allowance for credit losses	$ 6,190	$ 5,717
Accumulated depreciation	$ 771,267	$ 788,922
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	349,000,000	349,000,000
Common stock, shares issued (in shares)	216,476,421	215,628,716
Common stock, shares outstanding (in shares)	216,476,421	215,628,716