Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net loss	$ (20,528)	$ (27,032)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	82,670	84,846
Amortization of debt discount	3,487	4,655
Amortization of debt issuance costs	5,238	6,430
Share-based compensation	7,613	4,351
Deferred income taxes	(3,019)	(6,726)
Equity in losses of investment	457	366
Loss on disposition of assets, net	39	0
(Gain) loss on early extinguishment of long-term debt	397	(546)
Unrealized gain and ineffectiveness on derivative contracts, net	(4,291)	(9,282)
Changes in operating assets and liabilities:
Accounts receivable, net	(21,709)	(27,346)
Other current assets	(12,145)	(10,853)
Income tax receivable	2,742	20,576
Accounts payable and accrued liabilities	30,675	(1,794)
Other non-current, net	(40,303)	(22,201)
Net cash provided by operating activities	31,323	15,444
Cash flows from investing activities:
Capital expenditures	(131,428)	(79,353)
Distribution from equity investment	0	1,200
Proceeds from sale of equity investment	0	25,000
Proceeds from sale of assets	10,000	10,887
Net cash used in investing activities	(121,428)	(42,266)
Cash flows from financing activities:
Proceeds from term loan	100,000	0
Repayment of term loan	(193,508)	(30,500)
Repayment of Nordea Q5000 Loan	(26,786)	(26,786)
Repayment of MARAD Debt	(6,222)	(5,926)
Repurchase of Convertible Senior Notes due 2032	0	(13,400)
Debt issuance costs	(3,694)	(1,230)
Net proceeds from issuance of common stock	219,504	94,538
Payments related to tax withholding for share-based compensation	(1,306)	(187)
Proceeds from issuance of ESPP shares	432	708
Net cash provided by financing activities	88,420	17,217
Effect of exchange rate changes on cash and cash equivalents	1,927	(2,481)
Net increase (decrease) in cash and cash equivalents	242	(12,086)
Cash and cash equivalents:
Balance, beginning of year	356,647	494,192
Balance, end of period	$ 356,889	$ 482,106

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from the stock plan during the period.

+ References

+ Details

Name:	us-gaap_ProceedsFromStockPlans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfConvertibleDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_RepaymentsOfOtherLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

+ Details

Name:	us-gaap_RepaymentsOfSecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

+ Details

Name:	us-gaap_UnrealizedGainLossOnDerivatives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration