Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income (loss)	$ (27,032)	$ 26,887
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	84,846	86,333
Amortization of debt issuance costs	6,430	4,117
Share-based compensation	4,351	7,941
Amortization of debt discount	4,655	4,409
Deferred income taxes	(6,726)	(2,403)
Equity in losses of investments	366	0
Gain on repurchase of long-term debt	(546)	0
Unrealized (gain) loss and ineffectiveness on derivative contracts, net	(9,282)	2,222
Changes in operating assets and liabilities:
Accounts receivable, net	(27,346)	(13,326)
Other current assets	(10,853)	6,610
Income tax receivable, net of income tax payable	20,576	(12,152)
Accounts payable and accrued liabilities	(1,794)	(52,045)
Other noncurrent, net	22,201	19,164
Net cash provided by operating activities	15,444	39,429
Cash flows from investing activities:
Capital expenditures	(79,353)	(280,523)
Distributions from equity investments, net of earnings	1,200	5,853
Proceeds from sale of equity investment	25,000	0
Proceeds from sale of assets	10,887	7,500
Net cash used in investing activities	(42,266)	(267,170)
Cash flows from financing activities:
Proceeds from Nordea Q5000 Loan	0	250,000
Repayment of Nordea Q5000 Loan	(26,786)	(8,929)
Repayment of Term Loan	(30,500)	(15,000)
Repayment of MARAD Debt	(5,926)	(5,644)
Repurchase of Convertible Senior Notes due 2032	(13,400)	0
Debt issuance costs	(1,230)	(1,611)
Net proceeds from issuance of common stock	94,538	0
Repurchase of common stock	(187)	(1,056)
Proceeds from issuance of ESPP shares	708	3,484
Net cash provided by financing activities	17,217	221,244
Effect of exchange rate changes on cash and cash equivalents	(2,481)	(1,059)
Net decrease in cash and cash equivalents	(12,086)	(7,556)
Cash and cash equivalents:
Balance, beginning of year	494,192	476,492
Balance, end of period	$ 482,106	$ 468,936