Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income (loss)	$ (61,684)	$ 20,084	$ 57,697
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	141,514	133,709	112,720
Goodwill impairment		6,689
Amortization of debt discounts		6,964	6,261
Amortization of debt issuance costs	3,179	3,177	3,600
Share-based compensation	7,689	8,568	11,469
Deferred income taxes	(15,202)	(3,883)	3,485
Equity in (earnings) losses of investment	1	(216)	(1,439)
(Gain) loss on disposition of assets, net	631	(889)
(Gain) loss on extinguishment of long-term debt	136	(9,239)	18
Unrealized gain on derivative contracts, net		(601)	(3,383)
Unrealized foreign currency (gain) loss	2,252	(2,665)	(628)
Changes in operating assets and liabilities:
Accounts receivable, net	(14,154)	(8,419)	(3,050)
Income tax receivable, net of income tax payable	18,610	(22,124)	(4,456)
Other current assets	22,973	(28,664)	25,383
Accounts payable and accrued liabilities	46,645	10,830	(31,265)
Other, net	12,473	14,521	6,743
Net cash provided by operating activities	140,117	98,800	169,669
Cash flows from investing activities:
Capital expenditures	(8,322)	(20,244)	(140,854)
STL acquisition, net			(4,081)
Proceeds from sale of assets	51	963	2,550
Net cash used in investing activities	(8,271)	(19,281)	(142,385)
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	(1,337)	(7,747)	(1,586)
Acquisition of redeemable noncontrolling interests	(2,355)
Payments related to tax withholding for share-based compensation	(2,001)	(5,264)	(1,680)
Proceeds from issuance of ESPP shares	654	622	462
Net cash used in financing activities	(95,997)	(52,578)	(45,818)
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(42)	1,818	1,636
Net increase (decrease) in cash and cash equivalents and restricted cash	35,807	28,759	(16,898)
Cash and cash equivalents and restricted cash:
Balance, beginning of year	291,320	262,561	279,459
Balance, end of year	327,127	291,320	262,561
Term Loan Repaid September 2021
Cash flows from financing activities:
Issuance of loan debt			35,000
Repayment of loan debt	(29,826)	(3,500)	(35,442)
Nordea Q5000 Loan Matured January 2021
Cash flows from financing activities:
Repayment of loan debt	(53,572)	(35,714)	(35,714)
MARAD Debt Maturing February 2027
Cash flows from financing activities:
Repayment of loan debt	$ (7,560)	$ (7,200)	$ (6,858)