Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019 USD ($) drilling_rigs	Jun. 30, 2018 USD ($) drilling_rigs	Jun. 30, 2019 USD ($) drilling_rigs segments	Jun. 30, 2018 USD ($) drilling_rigs	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments \| segments			5
Revenues	$ 152,843	$ 154,782	$ 299,411	$ 299,260
Operating costs	115,970	114,197	224,555	216,963
Consolidated Gross Margin	36,873	40,585	74,856	82,297
Total assets	723,669	757,044	723,669	757,044	$ 741,550
Depreciation	22,851	23,287	45,504	47,034
Capital Expenditures	9,241	19,337	27,616	33,925
Related Party Transaction, Due from (to) Related Party, Current	0		$ 0		$ 0
Drilling Services [Member]
Segment Reporting Information [Line Items]
Number of Operating Segments \| segments			2
Revenues	65,074	57,407	$ 124,726	110,944
Operating costs	43,253	38,813	82,207	72,672
Consolidated Gross Margin	21,821	18,594	42,519	38,272
Total assets	412,635	422,812	412,635	422,812
Depreciation	12,261	11,440	24,149	23,336
Capital Expenditures	$ 3,849	5,949	$ 13,849	11,407
Drilling Rigs \| drilling_rigs	25		25
Drilling Services [Member] \| Domestic Drilling [Member]
Segment Reporting Information [Line Items]
Revenues	$ 39,652	35,634	$ 77,661	71,560
Operating costs	24,698	21,749	47,167	42,647
Consolidated Gross Margin	14,954	13,885	30,494	28,913
Total assets	365,477	380,355	365,477	380,355
Depreciation	10,888	10,139	21,433	20,588
Capital Expenditures	3,325	4,736	11,567	7,494
Related Party Transaction, Due from (to) Related Party, Current	38,600	35,100	38,600	35,100
Drilling Services [Member] \| International Drilling [Member]
Segment Reporting Information [Line Items]
Revenues	25,422	21,773	47,065	39,384
Operating costs	18,555	17,064	35,040	30,025
Consolidated Gross Margin	6,867	4,709	12,025	9,359
Total assets	47,158	42,457	47,158	42,457
Depreciation	1,373	1,301	2,716	2,748
Capital Expenditures	524	1,213	2,282	3,913
Related Party Transaction, Due from (to) Related Party, Current	$ (38,600)	$ (35,100)	$ (38,600)	$ (35,100)
Drilling Services [Member] \| International Drilling [Member] \| Drilling Rigs [Member]
Segment Reporting Information [Line Items]
Drilling Rigs \| drilling_rigs	5	5	5	5
Drilling Services [Member] \| International Drilling [Member] \| Assets Leased From Others [Member]
Segment Reporting Information [Line Items]
Drilling Rigs \| drilling_rigs	3	3	3	3
Drilling Services [Member] \| United States [Member] \| Domestic Drilling [Member]
Segment Reporting Information [Line Items]
Drilling Divisions	3		3
Drilling Rigs \| drilling_rigs	17		17
Production Services [Member]
Segment Reporting Information [Line Items]
Number of Operating Segments \| segments			3
Revenues	$ 87,769	$ 97,375	$ 174,685	$ 188,316
Operating costs	72,717	75,384	142,348	144,291
Consolidated Gross Margin	15,052	21,991	32,337	44,025
Total assets	252,885	255,590	252,885	255,590
Depreciation	10,380	11,580	20,865	23,140
Capital Expenditures	5,016	13,137	13,270	22,023
Production Services [Member] \| Well Servicing [Member]
Segment Reporting Information [Line Items]
Revenues	29,506	23,162	55,760	44,276
Operating costs	21,038	16,680	39,934	32,250
Consolidated Gross Margin	8,468	6,482	15,826	12,026
Total assets	121,180	124,458	121,180	124,458
Depreciation	4,942	4,865	9,824	9,785
Capital Expenditures	2,141	3,403	6,036	5,452
Production Services [Member] \| Wireline Services [Member]
Segment Reporting Information [Line Items]
Revenues	47,386	62,137	93,260	118,738
Operating costs	41,804	46,716	81,151	89,202
Consolidated Gross Margin	5,582	15,421	12,109	29,536
Total assets	94,413	99,243	94,413	99,243
Depreciation	3,907	4,601	7,982	9,209
Capital Expenditures	1,588	4,917	4,423	8,590
Production Services [Member] \| Coiled Tubing Services [Member]
Segment Reporting Information [Line Items]
Revenues	10,877	12,076	25,665	25,302
Operating costs	9,875	11,988	21,263	22,839
Consolidated Gross Margin	1,002	88	4,402	2,463
Total assets	37,292	31,889	37,292	31,889
Depreciation	1,531	2,114	3,059	4,146
Capital Expenditures	1,287	4,817	2,811	7,981
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	58,149	78,642	58,149	78,642
Depreciation	210	267	490	558
Capital Expenditures	$ 376	$ 251	$ 497	$ 495

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