Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Net income (loss)	$ (35,776)	$ 15,967
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	106,226	99,552
Goodwill impairment		6,689
Amortization of debt discounts		5,094
Amortization of debt issuance costs	2,596	2,401
Share-based compensation	5,783	6,394
Deferred income taxes	(10,375)	3,901
(Gain) loss on disposition of assets, net	631	(913)
(Gain) loss on extinguishment of long-term debt	124	(9,239)
Unrealized gain on derivative contracts, net		(601)
Unrealized foreign currency loss	2,041	2,891
Changes in operating assets and liabilities:
Accounts receivable, net	(6,631)	(35,276)
Other current assets	16,604	(28,036)
Income tax payable, net of income tax receivable	20,912	(26,342)
Accounts payable and accrued liabilities	28,577	32,075
Other, net	9,460	15,929
Net cash provided by operating activities	121,252	58,628
Cash flows from investing activities:
Capital expenditures	(7,386)	(19,193)
Proceeds from sale of assets	51	938
Net cash used in investing activities	(7,335)	(18,255)
Cash flows from financing activities:
Proceeds from convertible senior notes		200,000
Repayment of convertible senior notes		(183,150)
Capped call transactions		(10,625)
Debt issuance costs	(1,209)	(7,075)
Acquisition of redeemable noncontrolling interests	(2,268)
Payments related to tax withholding for share-based compensation	(1,878)	(5,161)
Proceeds from issuance of ESPP shares	654	622
Net cash used in financing activities	(95,659)	(42,000)
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(747)	(1,600)
Net increase (decrease) in cash and cash equivalents and restricted cash	17,511	(3,227)
Cash and cash equivalents and restricted cash:
Balance, beginning of year	291,320	262,561
Balance, end of period	308,831	259,334
Term Loan Repaid September 2021
Cash flows from financing activities:
Repayment of loan debt	(29,826)	(2,625)
Nordea Q5000 Loan Matured January 2021
Cash flows from financing activities:
Repayment of loan debt	(53,572)	(26,786)
MARAD Debt Maturing February 2027
Cash flows from financing activities:
Repayment of loan debt	$ (7,560)	$ (7,200)