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Segment Information - Disaggregation of Revenue by Revenue Source and Geography (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Total Revenues $ 132,085 $ 117,659 $ 247,654 $ 228,390
United States        
Disaggregation of Revenue [Line Items]        
Total Revenues 67,555 63,471 132,320 127,147
International        
Disaggregation of Revenue [Line Items]        
Total Revenues 64,530 54,188 115,334 101,243
Europe/Middle East/Africa        
Disaggregation of Revenue [Line Items]        
Total Revenues 34,447 36,719 64,693 65,205
Latin America        
Disaggregation of Revenue [Line Items]        
Total Revenues 12,983 9,128 20,457 19,060
Asia Pacific        
Disaggregation of Revenue [Line Items]        
Total Revenues 7,669 4,926 13,663 9,489
Other countries        
Disaggregation of Revenue [Line Items]        
Total Revenues 9,431 3,415 16,521 7,489
International Services        
Disaggregation of Revenue [Line Items]        
Total Revenues 59,361 53,499 108,094 100,109
International Services | United States        
Disaggregation of Revenue [Line Items]        
Total Revenues 0 0 0 0
International Services | International        
Disaggregation of Revenue [Line Items]        
Total Revenues 59,361 53,499 108,094 100,109
U.S. Services        
Disaggregation of Revenue [Line Items]        
Total Revenues 35,136 29,905 67,743 60,871
U.S. Services | United States        
Disaggregation of Revenue [Line Items]        
Total Revenues 35,136 29,905 67,743 60,871
U.S. Services | International        
Disaggregation of Revenue [Line Items]        
Total Revenues 0 0 0 0
Tubular Sales        
Disaggregation of Revenue [Line Items]        
Total Revenues 14,061 16,141 29,281 33,086
Tubular Sales | United States        
Disaggregation of Revenue [Line Items]        
Total Revenues 14,001 15,775 29,105 32,334
Tubular Sales | International        
Disaggregation of Revenue [Line Items]        
Total Revenues 60 366 176 752
Blackhawk        
Disaggregation of Revenue [Line Items]        
Total Revenues 23,527 18,114 42,536 34,324
Blackhawk | United States        
Disaggregation of Revenue [Line Items]        
Total Revenues 18,418 17,791 35,472 33,942
Blackhawk | International        
Disaggregation of Revenue [Line Items]        
Total Revenues $ 5,109 $ 323 $ 7,064 $ 382