Basis of Presentation and Accounting Policy Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Accumulated Translation Adjustment [Member]	Dec. 31, 2013 Accumulated Translation Adjustment [Member]	Jun. 30, 2014 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Dec. 31, 2013 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	Jun. 30, 2014 Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2013 Other Postretirement Benefit Plans, Defined Benefit [Member]	Jun. 30, 2014 Non-Controlling Interests In Subsidiaries [Member]	Jun. 30, 2014 Non-Controlling Interests In Subsidiaries [Member] Accumulated Translation Adjustment [Member]	Dec. 31, 2013 Non-Controlling Interests In Subsidiaries [Member] Accumulated Translation Adjustment [Member]	Jun. 30, 2014 Non-Controlling Interests In Subsidiaries [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2013 Non-Controlling Interests In Subsidiaries [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Jun. 30, 2014 Offshore Marine Services [Member]	Dec. 31, 2013 Offshore Marine Services [Member]	Jun. 30, 2013 Offshore Marine Services [Member]	Dec. 31, 2012 Offshore Marine Services [Member]
Deferred Revenue																	$ 6,794	$ 6,592	$ 6,592	$ 6,592
Accumulated Other Comprehensive Income (Loss), Net of Tax	225		225		(1,192)	365	(927)	(132)	(257)	(8)	(8)		634	395	(5)	(5)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent			2,180			1,988		192		0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Noncontrolling Interest													239		0
Other Comprehensive Income (Loss), before Tax	1,967	142	2,419	(3,840)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent			(763)			(696)		(67)		0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest													0		0
Other Comprehensive Income (Loss), Tax	621	41	763	(1,186)
Other Comprehensive Income (Loss), Net of Tax	$ 1,346	$ 101	$ 1,656	$ (2,654)								$ (239)