Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Property and Equipment
Total property and equipment	$ 1,426,975	$ 1,056,327
Less accumulated depreciation	(252,892)	(231,276)
Total	1,174,083	825,051
Buildings and improvements
Property and Equipment
Total property and equipment	930,169	667,172
Land
Property and Equipment
Total property and equipment	384,078	288,929
Fixtures and equipment
Property and Equipment
Total property and equipment	32,985	26,577
Construction in process
Property and Equipment
Total property and equipment	72,213	66,119
Construction in process | Ethanol plant
Property and Equipment
Total	30,500	30,500
Capitalized internal use software
Property and Equipment
Total property and equipment	$ 7,530	$ 7,530