Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Statement of Cash Flows [Abstract]
Net income	$ 15,967	$ 49,763
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	99,552	84,420
Goodwill impairment	6,689	0
Amortization of debt discounts	5,094	4,642
Amortization of debt issuance costs	2,401	2,752
Share-based compensation	6,394	8,979
Deferred income taxes	3,901	2,347
Equity in losses of investment	33	82
Gain on disposition of assets, net	(913)	0
(Gain) loss on extinguishment of long-term debt	(9,239)	18
Unrealized gain on derivative contracts, net	(601)	(2,351)
Unrealized foreign currency loss	2,891	636
Changes in operating assets and liabilities:
Accounts receivable, net	(35,276)	(45,399)
Income tax receivable	26,342	3,143
Other current assets	(28,036)	12,215
Accounts payable and accrued liabilities	32,042	(15,401)
Other, net	15,929	9,683
Net cash provided by operating activities	58,628	89,877
Cash flows from investing activities:
Capital expenditures	(19,193)	(45,636)
STL acquisition, net	0	(4,081)
Proceeds from sale of assets	938	2,550
Net cash used in investing activities	(18,255)	(47,167)
Cash flows from financing activities:
Proceeds from convertible senior notes	200,000	0
Repayment of convertible senior notes	(183,150)	0
Proceeds from term loan	0	35,000
Repayment of term loans	(2,625)	(34,567)
Repayment of Nordea Q5000 Loan	(26,786)	(26,786)
Repayment of MARAD Debt	(7,200)	(6,858)
Capped call transactions	(10,625)	0
Debt issuance costs	(7,075)	(1,544)
Payments related to tax withholding for share-based compensation	(5,161)	(1,345)
Proceeds from issuance of ESPP shares	622	462
Net cash used in financing activities	(42,000)	(35,638)
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(1,600)	(191)
Net increase (decrease) in cash and cash equivalents and restricted cash	(3,227)	6,881
Cash and cash equivalents and restricted cash:
Balance, beginning of year	262,561	279,459
Balance, end of period	$ 259,334	$ 286,340

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