Summary of Significant Accounting Policies Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ (2,193)	$ 103	$ (1,914)	$ 425	$ (11,176)	$ 2,324	$ 1,150	$ 1,197	$ (3,579)	$ (6,505)	$ 4,793
Weighted Average Number of Shares Outstanding, Basic									50,082	50,082	50,082
Net Income Allocated to Class A Stock									$ (3,543)	$ (6,439)	$ 4,745
Net Income Allocated to Class B Stock									$ (36)	$ (66)	$ 48
Common Class A [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted Average Number of Shares Outstanding, Basic									49,080	49,080	49,080
Earnings Per Share, Basic and Diluted									$ (0.07)	$ (0.13)	$ 0.10
Common Class B [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted Average Number of Shares Outstanding, Basic and Diluted									1,002	1,002	1,002
Earnings Per Share, Basic and Diluted									$ (0.04)	$ (0.07)	$ 0.05