Stockholders' (Deficit) Equity Dividends Declared on Common Stock or In Excess (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Dividends Payable [Line Items]
Dividends declared from retained earnings	$ (52,234)	$ (67,708)	$ (66,516)
Dividends declared from additional paid-in capital	(17,718)
(Accumulated Deficit) Retained Earnings
Dividends Payable [Line Items]
Dividends declared from retained earnings	(52,641)	(67,833)	(66,644)
Additional Paid-in Capital
Dividends Payable [Line Items]
Dividends declared from retained earnings	407	$ 125	$ 128
Dividends declared from additional paid-in capital	$ (17,718)