Significant Accounting Policies - Earnings per share (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
RECENT ACCOUNTING STANDARDS
Net income available for stockholders	$ 195,113	$ 218,363	$ 7,217
Less: Adjustments for losses attributable to participating securities	(3,099)	(3,197)	(89)
Net income used in calculating earnings per share	$ 192,014	$ 215,166	$ 7,128
Weighted average shares outstanding (including participating securities)	216,472	216,518	215,646
Adjustment for participating securities	(3,545)	(3,187)	(2,656)
Shares used in calculating basic earnings per share	212,927	213,331	212,990