CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net Loss		$ (8,839)	$ (65,394)	$ (489,910)
Non-cash items included in net loss:
Depreciation and amortization		100,334	93,185	84,580
Drydock amortization		17,947	19,719	18,467
Loss (gain) on asset impairments		6,808	(9,002)	84,482
Stock-based compensation charges		16,593	18,565	21,100
Loss from investments in unconsolidated affiliates		21,486	7,848	16,116
Loss (gain) on foreign currency, net		6,238	(10,310)	(13,247)
Restructuring expense (gain)		7,473	(2,310)	18,044
Loss (gains) on asset disposals		1,443	(46,201)	(15,200)
Deferred income taxes		3,525	891	(5,359)
Pension expense		19,821	(4,291)	(3,865)
Debt issuance cost amortization		12,767	22,915	3,715
Other non-cash items		1,269	686	(2,164)
Changes in assets and liabilities that provided (used) cash:
Accounts receivable		(82,697)	166,385	30,156
Contracts in progress net of advance billings on contracts		(113,338)	(10,695)	171,397
Accounts payable		78,646	(154,439)	(17,493)
Accrued and other current liabilities		(33,969)	(2,801)	(22,155)
Pension liability		(1,506)	(1,861)	(30,828)
Income taxes		1,778	(4,668)	(54,431)
Other assets and liabilities		(507)	(11,262)	(50,016)
Total cash provided by (used in) operating activities		55,272	6,960	(256,611)
Cash flows from investing activities:
Purchases of property, plant and equipment	[1]	(102,851)	(321,187)	(283,962)
(Increase) decrease in restricted cash and cash equivalents		70,784	(163,933)	(5,536)
Purchases of available-for-sale securities			(3,695)	(10,535)
Sales and maturities of available-for-sale securities		3,176	12,978	43,959
Investments in unconsolidated affiliates		(7,038)	(2,420)	(9,354)
Proceeds from asset dispositions		10,724	71,961	37,386
Other investing activities		417	(2,706)	(3,113)
Total cash used in investing activities		(24,788)	(409,002)	(231,155)
Cash flows from financing activities:
Proceeds from debt			1,328,875	296,000
Repayment of debt		(26,938)	(298,534)	(310,146)
Issuance of common stock		682	327	68
Repurchase of common stock		(1,720)	(1,707)	(1,106)
Payment of debt issuance costs		(170)	(39,112)	(4,905)
Distributions to noncontrolling interests			(6,352)	(13,743)
Acquisition of noncontrolling interest		(24)	(32,943)
Total cash provided by (used in) financing activities		(28,170)	950,554	(33,832)
Effects of exchange rate changes on cash and cash equivalents		(2,779)	(1,905)	153
Net increase (decrease) in cash and cash equivalents		(465)	546,607	(521,445)
Cash and cash equivalents at beginning of year		665,309	118,702	640,147
Cash and cash equivalents at end of year		664,844	665,309	118,702
Cash paid during the period for:
Income taxes (net of refunds)		40,560	26,661	$ 105,444
Cash paid for interest, net of amounts capitalized		40,690	28,390
Supplemental Disclosure of Noncash Investing Activities:
Non-cash investment in unconsolidated affiliates		$ 2,396
Capital lease			3,407
Supplemental Disclosure of Noncash Financing Activities:
Non-cash acquisition of noncontrolling interest			$ 11,136

[1] Total capital expenditures represent expenditures for which cash payments were made during the period. Capital expenditures for 2015 and 2014 include $14 million and $27 million of cash payments for accrued capital expenditures outstanding at December 31, 2014 and 2013, respectively. Capital expenditures for 2013 exclude approximately $48 million in accrued capital expenditures.