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Industry Segments and Geographic Information Industry Segments and Geographic Information 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 1,037,933 | $ 998,775 | $ 723,098
Transfers between geographic areas | (1,802) | (3,157) | (2,025)
Identifiable assets | 1,271,922 | 1,385,527 | 1,308,614
UNITED STATES |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 848,681 | 791,389 | 545,964
Transfers between geographic areas | 0 | 0 | 0
Identifiable assets | 1,099,048 | 1,211,759 | 1,131,650
Canada and Mexico [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 31,561 | 41,524 | 36,074
Transfers between geographic areas | 0 | 0 | 0
Identifiable assets | 53,015 | 59,355 | 62,537
South America [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 24,371 | 25,781 | 28,040
Transfers between geographic areas | 0 | 0 | 0
Identifiable assets | 30,111 | 25,122 | 23,352
Europe [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 94,533 | 93,262 | 80,721
Transfers between geographic areas | 1,802 | 3,157 | 2,025
Identifiable assets | 62,684 | 57,807 | 61,000
Africa [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 17,415 | 12,367 | 700
Transfers between geographic areas | 0 | 0 | 0
Identifiable assets | 10,812 | 14,772 | 3,696
Asia and other [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 21,372 | 34,452 | 31,599
Transfers between geographic areas | 0 | 0 | 0
Identifiable assets | $ 16,252 | $ 16,712 | $ 26,379

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