Segment Information (Schedule of Segment Reporting Information) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) drilling_rigs	Dec. 31, 2018 USD ($) drilling_rigs
Segment Reporting Information [Line Items]
Revenues	$ 575,792	$ 590,097
Operating costs	431,353	429,913
Segment/Consolidated Margin	144,439	160,184
Identifiable assets	673,954	741,550
Depreciation	90,884	93,554
Capital Expenditures	44,829	72,854
Related Party Transaction, Due from (to) Related Party, Current	0	0
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	47,698	80,806
Depreciation	944	1,127
Capital Expenditures	1,300	1,140
Drilling Services [Member]
Segment Reporting Information [Line Items]
Revenues	240,701	229,837
Operating costs	157,190	150,984
Segment/Consolidated Margin	83,511	78,853
Identifiable assets	407,062	416,583
Depreciation	48,827	46,917
Capital Expenditures	$ 22,701	29,907
Drilling Rigs \| drilling_rigs	25
Drilling Services [Member] \| Domestic Drilling [Member]
Segment Reporting Information [Line Items]
Revenues	$ 151,769	145,676
Operating costs	92,183	86,910
Segment/Consolidated Margin	59,586	58,766
Identifiable assets	347,036	373,370
Depreciation	43,162	41,289
Capital Expenditures	17,889	23,598
Related Party Transaction, Due from (to) Related Party, Current	36,100	40,100
Drilling Services [Member] \| International Drilling [Member]
Segment Reporting Information [Line Items]
Revenues	88,932	84,161
Operating costs	65,007	64,074
Segment/Consolidated Margin	23,925	20,087
Identifiable assets	60,026	43,213
Depreciation	5,665	5,628
Capital Expenditures	4,812	6,309
Related Party Transaction, Due from (to) Related Party, Current	$ (36,100)	$ (40,100)
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	$ 335,091	$ 360,260
Operating costs	274,163	278,929
Segment/Consolidated Margin	60,928	81,331
Identifiable assets	219,194	244,161
Depreciation	41,113	45,510
Capital Expenditures	20,828	41,807
Production Services [Member] \| Well Servicing [Member]
Segment Reporting Information [Line Items]
Revenues	115,715	93,800
Operating costs	83,461	67,554
Segment/Consolidated Margin	32,254	26,246
Identifiable assets	116,473	118,923
Depreciation	19,894	19,578
Capital Expenditures	10,185	10,002
Production Services [Member] \| Wireline Services [Member]
Segment Reporting Information [Line Items]
Revenues	172,931	215,858
Operating costs	151,145	167,337
Segment/Consolidated Margin	21,786	48,521
Identifiable assets	71,887	87,912
Depreciation	14,772	17,945
Capital Expenditures	5,907	15,247
Production Services [Member] \| Coiled Tubing Services [Member]
Segment Reporting Information [Line Items]
Revenues	46,445	50,602
Operating costs	39,557	44,038
Segment/Consolidated Margin	6,888	6,564
Identifiable assets	30,834	37,326
Depreciation	6,447	7,987
Capital Expenditures	$ 4,736	$ 16,558

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