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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

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