Property, Plant and Equipment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Land	[1]	$ 145,912	$ 56,249
Land improvements		59,423	49,099
Buildings and improvements	[1]	297,163	214,364
Machinery and equipment	[2]	2,305,641	2,106,451
Long-term mineral rights and production equipment costs		652,871	85,888
Construction in progress		420,152	108,619
Total		$ 3,881,162	$ 2,620,670
Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		2 years
Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		60 years
Land improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		5 years
Land improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		30 years
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		10 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		45 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		2 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		45 years
Long-term mineral rights and production equipment costs | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		7 years
Long-term mineral rights and production equipment costs | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		60 years

[1] Includes Land under capital lease of $2.8 million and Buildings and improvements under capital lease of $9.9 million at December 31, 2015.

[2] Consists primarily of (1) short-lived production equipment components, office and building equipment and other equipment with estimated lives ranging 2 – 7 years, (2) production process equipment (intermediate components) with estimated lives ranging 8 – 19 years, (3) production process equipment (major unit components) with estimated lives ranging 20 – 29 years, and (4) production process equipment (infrastructure and other) with estimated lives ranging 30 – 45 years.