Stockholders' Equity and Restrictions Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ 38,137	$ (2,799)	$ 5,022	$ (3,573)	$ 1,538	$ (7,915)	$ (1,027)	$ (3,584)	$ 36,787	$ (10,988)	$ (1,370)
Weighted Average Number of Shares Outstanding, Basic									49,972,000	50,402,000	50,216,000
Weighted Average Number of Shares Outstanding, Diluted									50,645,000	50,940,000	50,349,000
Common Stock Class A [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic									$ 36,673	$ (10,878)	$ (1,356)
Weighted Average Number of Shares Outstanding, Basic									49,664,000	49,400,000	49,214,000
Earnings Per Share, Basic	$ 0.77	$ (0.06)	$ 0.10	$ (0.07)	$ 0.03	$ (0.16)	$ (0.02)	$ (0.07)	$ 0.74	$ (0.22)	$ (0.03)
Net Income (Loss) Available to Common Stockholders, Diluted									$ 36,675	$ (10,878)	$ (1,356)
Weighted Average Number of Shares Outstanding, Diluted									50,337,000	49,938,000	49,347,000
Earnings Per Share, Diluted	0.77	(0.06)	0.10	(0.07)	0.03	(0.16)	(0.02)	(0.07)	$ 0.73	$ (0.22)	$ (0.03)
Common Stock Class B [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic									$ 114	$ (110)	$ (14)
Weighted Average Number of Shares Outstanding, Basic									308,000	1,002,000	1,002,000
Earnings Per Share, Basic	0.36	0	0.05	(0.04)	0.01	(0.07)	(0.01)	(0.04)	$ 0.37	$ (0.11)	$ (0.01)
Net Income (Loss) Available to Common Stockholders, Diluted									$ 112	$ (110)	$ (14)
Weighted Average Number of Shares Outstanding, Diluted									308,000	1,002,000	1,002,000
Earnings Per Share, Diluted	$ 0.36	$ 0	$ 0.05	$ (0.04)	$ 0.01	$ (0.07)	$ (0.01)	$ (0.04)	$ 0.36	$ (0.11)	$ (0.01)