Leased Property (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Leased property under capital lease	$ 58,604	$ 3,367
Less: accumulated depreciation	(4,544)	(1,700)
Leased property under capital lease, net	54,060	1,667
Depreciation	4,650	2,006	$ 1,946
Leased property.
Depreciation	$ 2,900	$ 500	$ 500