Major Customers And Segment Information (Property And Equipment Based Upon The Assets' Physical Location) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Net property and equipment	$ 1,476,335	$ 1,584,876	$ 1,440,657
Middle East [Member]
Segment Reporting Information [Line Items]
Net property and equipment	61,134	99,863	70,431
Asia [Member]
Segment Reporting Information [Line Items]
Net property and equipment	21,485	25,305	25,542
Africa Primarily West Africa [Member]
Segment Reporting Information [Line Items]
Net property and equipment	73,137	77,860	89,166
UNITED STATES
Segment Reporting Information [Line Items]
Net property and equipment	1,094,370	1,158,038	986,404
Mexico Central And South America [Member]
Segment Reporting Information [Line Items]
Net property and equipment	132,496	126,179	172,398
Europe Primarily North Sea [Member]
Segment Reporting Information [Line Items]
Net property and equipment	$ 93,713	$ 97,631	$ 96,716