Consolidated Statements of Common Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Noncontrolling Interest
Balance at the beginning of the period (in shares) at Dec. 31, 2018		48,065
Balance at the beginning of the period at Dec. 31, 2018	$ 730,157	$ 481	$ 337,623	$ 392,053	$ 0
Increase (Decrease) in Stockholders' Equity
Net income	63,116			63,116
Issuance of common stock (in shares)		515
Issuance of common stock	27,153	$ 5	27,148
Repurchase of common stock (in shares)		(48)
Repurchase of common stock	(2,497)	$ (1)	(2,496)
Dividends paid on common stock	(38,023)			(38,023)
Balance at the end of the period (in shares) at Dec. 31, 2019		48,532
Balance at the end of the period at Dec. 31, 2019	779,906	$ 485	362,275	417,146	0
Increase (Decrease) in Stockholders' Equity
Net income	96,831			96,831
Issuance of common stock (in shares)		1,836
Issuance of common stock	88,054	$ 18	88,036
Repurchase of common stock (in shares)		(34)
Repurchase of common stock	(1,679)	$ 0	(1,679)
Dividends paid on common stock	(41,768)			(41,768)
Balance at the end of the period (in shares) at Dec. 31, 2020		50,334
Balance at the end of the period at Dec. 31, 2020	921,344	$ 503	448,632	472,209	0
Increase (Decrease) in Stockholders' Equity
Net income	100,979			101,125	(146)
Issuance of common stock (in shares)		3,415
Issuance of common stock	204,528	$ 34	204,494
Repurchase of common stock (in shares)		(33)
Repurchase of common stock	(1,767)		(1,767)
Dividends paid on common stock	(47,398)			(47,398)
Acquisition of business with noncontrolling interest	5,294				5,294
Investment in business with noncontrolling interest	0		(238)		(238)
Balance at the end of the period (in shares) at Dec. 31, 2021		53,716
Balance at the end of the period at Dec. 31, 2021	$ 1,182,980	$ 537	$ 651,121	$ 525,936	$ 5,386