Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit)
Beginning Balance at Dec. 31, 2013	$ 22.9	$ 0.2	$ 39.8	$ (17.1)
Net income and comprehensive income	2.2			2.2
Repurchase of shares of common stock	(0.8)		(0.8)
Stock compensation expense	1.4		1.4
Ending Balance at Dec. 31, 2014	25.7	0.2	40.4	(14.9)
Net income and comprehensive income	26.0			26.0
Repurchase of shares of common stock	(0.6)		(0.6)
Stock compensation expense	1.8		1.8
Ending Balance at Dec. 31, 2015	52.9	0.2	41.6	11.1
Net income and comprehensive income	16.3			16.3
Repurchase of shares of common stock	(0.4)		(0.4)
Stock compensation expense	1.7	0.1	1.6
Ending Balance at Dec. 31, 2016	$ 70.5	$ 0.3	$ 42.8	$ 27.4