Segment Information (Schedule of Segment Reporting Information) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) drilling_rigs	Mar. 31, 2020 USD ($) drilling_rigs		Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Revenues	$ 58,738	$ 114,322
Operating costs	45,326	92,022
Gross margin	13,412	22,300
Identifiable assets	302,553	615,734		$ 314,430
Depreciation and amortization	13,365	21,984
Capital Expenditures	3,814	7,861
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	56,785	42,199
Depreciation and amortization	101	227
Capital Expenditures	37	1
Drilling Services [Member]
Segment Reporting Information [Line Items]
Revenues	33,546	50,346
Operating costs	23,534	36,003
Gross margin	10,012	14,343
Identifiable assets	182,234	387,703
Depreciation and amortization	9,438	12,206
Capital Expenditures	$ 2,950	4,408
Drilling Rigs | drilling_rigs	25
Drilling Services [Member] | Domestic Drilling [Member]
Segment Reporting Information [Line Items]
Revenues	$ 22,483	35,891
Operating costs	15,459	23,865
Gross margin	7,024	12,026
Identifiable assets	141,186	336,260
Depreciation and amortization	6,290	10,905
Capital Expenditures	2,385	3,241
Intercompany receivable (payable)	28,500	32,900
Drilling Services [Member] | International Drilling [Member]
Segment Reporting Information [Line Items]
Revenues	11,063	14,455
Operating costs	8,075	12,138
Gross margin	2,988	2,317
Identifiable assets	41,048	51,443	[1]
Depreciation and amortization	3,148	1,301
Capital Expenditures	565	1,167
Intercompany receivable (payable)	$ (28,500)	$ (32,900)
Drilling Services [Member] | Drilling Rigs | International Drilling [Member]
Segment Reporting Information [Line Items]
Drilling Rigs | drilling_rigs	5	5
Drilling Services [Member] | Assets Leased From Others [Member] | International Drilling [Member]
Segment Reporting Information [Line Items]
Drilling Rigs | drilling_rigs	3	3
Production Services [Member]
Segment Reporting Information [Line Items]
Revenues	$ 25,192	$ 63,976
Operating costs	21,792	56,019
Gross margin	3,400	7,957
Identifiable assets	63,534	185,832
Depreciation and amortization	3,826	9,551
Capital Expenditures	827	3,452
Production Services [Member] | Well Servicing [Member]
Segment Reporting Information [Line Items]
Revenues	14,857	25,616
Operating costs	11,888	20,951
Gross margin	2,969	4,665
Identifiable assets	41,778	107,747
Depreciation and amortization	2,936	4,781
Capital Expenditures	335	1,717
Production Services [Member] | Wireline Services [Member]
Segment Reporting Information [Line Items]
Revenues	10,335	33,133
Operating costs	9,878	28,284
Gross margin	457	4,849
Identifiable assets	19,399	66,712
Depreciation and amortization	890	3,077
Capital Expenditures	492	1,572
Production Services [Member] | Coiled Tubing Services [Member]
Segment Reporting Information [Line Items]
Revenues	0	5,227
Operating costs	26	6,784
Gross margin	(26)	(1,557)
Identifiable assets	2,357	11,373
Depreciation and amortization	0	1,693
Capital Expenditures	$ 0	$ 163

[1] Identifiable assets for our international drilling segment include five drilling rigs that are owned by our Colombia subsidiary and three drilling rigs that are owned by one of our domestic subsidiaries and leased to our Colombia subsidiary.