Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Noncontrolling Interest [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balances (in shares) at Dec. 31, 2017								39,871,314
Balances (Accounting Standards Update 2014-09 [Member]) at Dec. 31, 2017	$ 0	$ 0	$ 0	$ (9,617)	$ (9,617)	$ 0	$ (9,617)
Balances at Dec. 31, 2017								$ 399	$ 160,376	$ 634	$ 712,041	$ 873,450	$ 47,697	$ 921,147
Net (loss) income								0	0	0	582	582	10,954	11,536
Other comprehensive (loss) income								$ 0	0	(1,383)	0	(1,383)	0	(1,383)
RSUs vested (in shares)								315,151
RSUs vested								$ 3	0	0	0	3	0	3
Amortized RSUs								$ 0	14,784	0	0	14,784	0	14,784
Common stock purchased for employee tax withholding for vested RSUs (in shares)								(112,476)
Common stock purchased for employee tax withholding for vested RSUs								$ (1)	(6,563)	0	0	(6,564)	0	(6,564)
Shares repurchased and retired (in shares)								(252,072)
Shares repurchased and retired								$ (3)	(9,991)	0	0	(9,994)	0	(9,994)
Dividends on common stock ($0.52 per share)								$ 0	0	0	(23,309)	(23,309)	0	(23,309)
Issuance of common stock for Layne acquisition (in shares)								5,624,021
Issuance of common stock for Layne acquisition								$ 56	321,019	0	0	321,075	48	321,123
Issuance of common stock for 8.0% Convertible Notes (See Note 14) (in shares)								1,202,134
Issuance of common stock for 8.0% Convertible Notes (See Note 14)								$ 12	53,011	0	0	53,023	0	53,023
Premium on 8.0% Convertible Notes (See Note 14)								0	30,702	0	0	30,702	0	30,702
Transactions with non-controlling interests, net								$ 0	0	0	0	0	(13,075)	(13,075)
Other (in shares)								17,817
Other								$ 1	1,221	0	(244)	978	0	978
Balances (in shares) at Dec. 31, 2018								46,665,889
Balances (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018	0	0	0	(539)	(539)	0	(539)
Balances at Dec. 31, 2018								$ 467	564,559	(749)	679,453	1,243,730	45,624	1,289,354
Net (loss) income								0	0	0	(60,191)	(60,191)	3,489	(56,702)
Other comprehensive (loss) income								$ 0	0	(1,896)		(1,896)	0	(1,896)
RSUs vested (in shares)								262,859
RSUs vested								$ 3	(3)	0	0	0	0	0
Amortized RSUs								$ 0	10,213	0	0	10,213	0	10,213
Common stock purchased for employee tax withholding for vested RSUs (in shares)								(91,591)
Common stock purchased for employee tax withholding for vested RSUs								$ (1)	(4,066)	0	0	(4,067)	0	(4,067)
Shares repurchased and retired (in shares)								(1,360,000)
Shares repurchased and retired								$ (13)	(32,821)	0	0	(32,834)	0	(32,834)
Dividends on common stock ($0.52 per share)								0	0	0	(24,166)	(24,166)	0	(24,166)
Transactions with non-controlling interests, net								$ 0	0	0	0	0	(12,168)	(12,168)
Other (in shares)								26,648
Other								$ 0	981	0	(204)	777	0	777
Sale of common stock warrant, net								$ 0	10,444	0	0	10,444	0	$ 10,444
Balances (in shares) at Dec. 31, 2019								45,503,805						45,503,805
Balances (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019	$ 0	$ 0	$ 0	$ (366)	$ (366)	$ 0	$ (366)
Balances at Dec. 31, 2019								$ 456	549,307	(2,645)	594,353	1,141,471	36,945	$ 1,178,416
Net (loss) income								0	0	0	(145,117)	(145,117)	(21,064)	(166,181)
Other comprehensive (loss) income								$ 0	0	(2,390)	0	(2,390)	0	(2,390)
RSUs vested (in shares)								191,171
RSUs vested								$ 2	(2)	0	0	0	0	0
Amortized RSUs								$ 0	6,377	0	0	6,377	0	6,377
Common stock purchased for employee tax withholding for vested RSUs (in shares)								(60,604)
Common stock purchased for employee tax withholding for vested RSUs								$ (1)	(884)	0	0	(885)	0	(885)
Dividends on common stock ($0.52 per share)								0	0	0	(23,734)	(23,734)	0	(23,734)
Transactions with non-controlling interests, net								$ 0	0	0	0	0	65	65
Other (in shares)								34,169
Other								$ 0	609	0	(301)	308	0	$ 308
Balances (in shares) at Dec. 31, 2020								45,668,541						45,668,541
Balances at Dec. 31, 2020								$ 457	$ 555,407	$ (5,035)	$ 424,835	$ 975,664	$ 15,946	$ 991,610