Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Property Plant And Equipment [Line Items]
Proceeds from sales of property, plant and equipment	$ 33	$ 417,242
Impairment of assets	$ 95,088
Malaysia [Member]
Property Plant And Equipment [Line Items]
Percentage of interest in oil and gas property sold during period		10.00%
Proceeds from sales of property, plant and equipment		$ 417,200
Gain (loss) on sale of assets, net of taxes		$ 199,500