Property, Plant and Equipment, Net - Schedule of Components (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment, Net
Property, plant and equipment, net	$ 297,679	$ 238,404
Land and land improvements
Property, Plant and Equipment, Net
Property, plant, and equipment, gross	17,850	17,410
Buildings and leasehold improvements
Property, Plant and Equipment, Net
Property, plant, and equipment, gross	98,977	88,825
Furniture and equipment
Property, Plant and Equipment, Net
Property, plant, and equipment, gross	186,377	160,546
Property, plant and equipment in service, net
Property, Plant and Equipment, Net
Property, plant, and equipment, gross	303,204	266,781
Accumulated depreciation	(125,370)	(108,425)
Property, plant and equipment, net	177,834	158,356
Construction in progress
Property, Plant and Equipment, Net
Property, plant and equipment, net	$ 119,845	$ 80,048