Shareholders' Deficit (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Jan. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 14, 2014	Jul. 22, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Equity issuance proceeds	$ 250.0	$ 0.0	$ 0.0	$ 250.0
Common stock, shares authorized		95,000,000	95,000,000		95,000,000
Previous maximum ownership percentage			19.99%		19.99%
Amortization of Beneficial Conversion Feature on Preferred Stock		$ 0.0	$ 0.0	$ 18.1
Preferred stock authorized shares		5,000,000	5,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, preferred shares		0	0
Beginning balance, common shares		32,141,000	30,667,000	10,173,000
Issuance of stock		0	0	0
Ending balance, preferred shares		0	0	0
Ending balance, common shares		32,473,000	32,141,000	30,667,000
Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Common stock shares converted from preferred		0	0	(2,333,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock	14,333,334	0	0	14,333,000
Common stock shares converted from preferred		0	0	2,333,000
Stock Issued During Period, Shares, Other		0	995,000	3,471,000
Issuance of equity awards, net		332,000	479,000	357,000
Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Common stock shares converted from preferred		0	0	(583,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, preferred shares		0	0	0
Issuance of stock	583,334	0	0	583,000
Common stock shares converted from preferred		0	0	583,000
Stock Issued During Period, Shares, Other		0	0	0
Issuance of equity awards, net		0	0	0
Ending balance, preferred shares			0	0
Series A Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Preferred stock authorized shares						1
Liquidation value per share						$ 1
Shares issued						1
Series B Preferred Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock		0	0	0