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Segment Information - Disaggregation of Revenue by Revenue Source and Geography (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Total Revenues $ 115,569 $ 110,731
United States    
Disaggregation of Revenue [Line Items]    
Total Revenues 64,766 63,677
International    
Disaggregation of Revenue [Line Items]    
Total Revenues 50,803 47,054
Europe/Middle East/Africa    
Disaggregation of Revenue [Line Items]    
Total Revenues 30,246 28,486
Latin America    
Disaggregation of Revenue [Line Items]    
Total Revenues 7,473 9,931
Asia Pacific    
Disaggregation of Revenue [Line Items]    
Total Revenues 5,994 4,563
Other countries    
Disaggregation of Revenue [Line Items]    
Total Revenues 7,090 4,074
International Services    
Disaggregation of Revenue [Line Items]    
Total Revenues 48,733 46,610
International Services | United States    
Disaggregation of Revenue [Line Items]    
Total Revenues 0 0
International Services | International    
Disaggregation of Revenue [Line Items]    
Total Revenues 48,733 46,610
U.S. Services    
Disaggregation of Revenue [Line Items]    
Total Revenues 32,607 30,966
U.S. Services | United States    
Disaggregation of Revenue [Line Items]    
Total Revenues 32,607 30,966
U.S. Services | International    
Disaggregation of Revenue [Line Items]    
Total Revenues 0 0
Tubular Sales    
Disaggregation of Revenue [Line Items]    
Total Revenues 15,220 16,945
Tubular Sales | United States    
Disaggregation of Revenue [Line Items]    
Total Revenues 15,105 16,559
Tubular Sales | International    
Disaggregation of Revenue [Line Items]    
Total Revenues 115 386
Blackhawk    
Disaggregation of Revenue [Line Items]    
Total Revenues 19,009 16,210
Blackhawk | United States    
Disaggregation of Revenue [Line Items]    
Total Revenues 17,054 16,152
Blackhawk | International    
Disaggregation of Revenue [Line Items]    
Total Revenues $ 1,955 $ 58