Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Merchandise	$ 0	$ 0	$ 0	$ 878	$ 0	$ 878	$ 15,908