Equity-based Compensation (Market-Based Restricted Stock Units) (Narrative) (Details) - Market-Based Restricted Stock Units [Member] - Equity Plan [Member] - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 28, 2016	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price threshold (in dollars per share)				$ 10
Closing price, threshold for consecutive trading days				20 days
Number of shares vested (shares)	610,839		610,839
Number of shares settled for tax withholding (shares)	199,858
Number of shares issued, net of tax withholding (shares)	410,981
General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ (0.1)	$ (0.8)