Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2015

Property, Plant And Equipment [Abstract]

Summary Of Property, Plant And Equipment

	December 31,
	2015		2014
Buildings, improvements and leasehold improvements	$	318,906	$	328,651
Marine vessels and equipment		87		55,494
Machinery and equipment		3,770,959		4,126,570
Automobiles, trucks, tractors and trailers		45,013		66,032
Furniture and fixtures		67,483		75,631
Construction-in-progress		74,683		102,895
Land		58,731		58,814
Oil and gas producing assets		66,285		189,294
Total		4,402,147		5,003,381
Accumulated depreciation and depletion		(2,278,856)		(2,269,542)
Property, plant and equipment, net	$	2,123,291	$	2,733,839