Right to Use Liability - Right to Use Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Right to Use Assets
Right to use assets	$ 5,741	$ 3,734
Accumulated depreciation	(3,449)	(2,301)
Total	2,292	1,433
Right To Use Assets
Right to Use Assets
Right to use assets	10,673	31,757
Accumulated depreciation	(667)	(1,457)
Total	$ 10,006	$ 30,300