Stockholders' Equity and Restrictions Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Attributable to Parent	$ 4,951	$ 2,046	$ (4,565)	$ (3,802)	$ (1,432)	$ (7,109)	$ (2,558)	$ 37	$ (1,370)	$ (11,062)	$ (38,127)
Weighted Average Number of Shares Outstanding, Basic									50,216	50,082	50,082
Weighted Average Number of Shares Outstanding, Diluted									50,349	50,141	50,082
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									$ (1,356)	$ (10,950)	$ (37,742)
Net Income (Loss) Available to Common Stockholders, Diluted									$ (1,356)	$ (10,950)	$ (37,742)
Weighted Average Number of Shares Outstanding, Basic									49,214	49,080	49,080
Weighted Average Number of Shares Outstanding, Diluted									49,347	49,139	49,080
Basic and diluted earnings (losses) per share common stock	$ 0.10	$ 0.04	$ (0.09)	$ (0.08)	$ (0.03)	$ (0.14)	$ (0.05)	$ 0.00	$ (0.03)	$ (0.22)	$ (0.77)
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									$ (14)	$ (112)	$ (385)
Net Income (Loss) Available to Common Stockholders, Diluted									$ (14)	$ (112)	$ (385)
Weighted Average Number of Shares Outstanding, Basic and Diluted									1,002	1,002	1,002
Basic and diluted earnings (losses) per share common stock	$ 0.05	$ 0.02	$ (0.04)	$ (0.04)	$ (0.01)	$ (0.07)	$ (0.03)	$ 0.00	$ (0.01)	$ (0.11)	$ (0.38)