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Industry Segments and Geographic Information Industry Segments and Geographic Information 2 (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 227,644 | $ 216,364 | $ 208,369 | $ 168,001 | $ 173,222 | $ 176,553 | $ 175,660 | $ 169,329 | $ 820,378 | $ 694,764 | $ 1,130,145
Transfers between geographic areas |  |  |  |  |  |  |  |  | (2,025) | (93) | (1,252)
Identifiable assets | 1,308,614 |  |  |  | 1,315,540 |  |  |  | 1,308,614 | 1,315,540 | 1,636,202
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 643,216 | 535,613 | 896,131
Transfers between geographic areas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Identifiable assets | 1,131,650 |  |  |  | 1,132,986 |  |  |  | 1,131,650 | 1,132,986 | 1,403,916
Canada and Mexico [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 35,975 | 34,560 | 44,542
Transfers between geographic areas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Identifiable assets | 62,537 |  |  |  | 64,163 |  |  |  | 62,537 | 64,163 | 74,260
South America [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 28,167 | 20,480 | 26,554
Transfers between geographic areas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Identifiable assets | 23,352 |  |  |  | 21,354 |  |  |  | 23,352 | 21,354 | 25,603
Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 80,721 | 71,882 | 80,432
Transfers between geographic areas |  |  |  |  |  |  |  |  | 2,025 | 93 | 1,252
Identifiable assets | 61,000 |  |  |  | 53,713 |  |  |  | 61,000 | 53,713 | 64,695
Africa [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 700 | 10,345 | 20,761
Transfers between geographic areas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Identifiable assets | 3,696 |  |  |  | 5,711 |  |  |  | 3,696 | 5,711 | 7,542
Asia and other [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 31,599 | 21,884 | 61,725
Transfers between geographic areas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Identifiable assets | 26,379 |  |  |  | 37,613 |  |  |  | 26,379 | 37,613 | 60,186
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Identifiable assets | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0

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