Consolidated Statements Of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Inventory Write-down			$ 30,490	$ 9,025
Revenue	$ 549,275	$ 743,613	1,783,158	2,340,688
Cost of services and products	513,832	575,300	1,555,002	1,841,381
Gross Margin	35,443	168,313	228,156	499,307
Selling, general and administrative expense	47,299	54,849	153,533	171,253
Income from Operations	(11,856)	113,464	74,623	328,054
Interest income	684	229	2,421	436
Interest expense	(6,325)	(6,396)	(18,924)	(18,696)
Equity earnings (losses) of unconsolidated affiliates	(246)	1,567	543	1,313
Other income (expense), net	570	(9,099)	(6,823)	(14,883)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(17,173)	99,765	51,840	296,224
Provision for income taxes	(5,375)	31,226	16,226	92,718
Net Income	$ (11,798)	$ 68,539	$ 35,614	$ 203,506
Cash Dividends declared per Share	$ 0.27	$ 0.27	$ 0.81	$ 0.81
Basic Earnings per Share	(0.12)	0.70	0.36	2.06
Diluted Earnings per Share	$ (0.12)	$ 0.70	$ 0.36	$ 2.06
ROVs [Member]
Asset Impairment Charges			$ 10,800
Subsea Products Member
Asset Impairment Charges			2,900
Subsea Products Member
Inventory Write-down			5,300
Revenue	$ 157,269	$ 220,039	542,978	$ 700,825
Income from Operations	6,109	46,079	71,870	138,379
ROVs [Member]
Inventory Write-down			25,200
Revenue	126,507	198,426	413,769	634,299
Income from Operations	$ (23,845)	$ 52,417	$ 21,162	$ 175,893