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Industry Segments and Geographic Information (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 225,435 | $ 254,303 | $ 221,101 | $ 208,559 | $ 231,140 | $ 233,986 | $ 234,909 | $ 180,796 | $ 909,398 | $ 880,831 | $ 845,275
Transfers between geographic areas |  |  |  |  |  |  |  |  | (112) | (172) | (322)
Identifiable assets | 1,206,533 |  |  |  | 1,261,818 |  |  |  | 1,206,533 | 1,261,818 | 1,203,310
US [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 673,376 | 625,885 | 671,926
Transfers between geographic areas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Identifiable assets | 852,483 |  |  |  | 913,080 |  |  |  | 852,483 | 913,080 | 994,151
Canada and Mexico [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 58,080 | 85,133 | 49,314
Transfers between geographic areas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Identifiable assets | 104,831 |  |  |  | 116,059 |  |  |  | 104,831 | 116,059 | 62,558
South America [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 31,788 | 42,482 | 28,765
Transfers between geographic areas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Identifiable assets | 43,326 |  |  |  | 51,858 |  |  |  | 43,326 | 51,858 | 43,295
Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 102,990 | 92,882 | 75,033
Transfers between geographic areas |  |  |  |  |  |  |  |  | 112 | 172 | 322
Identifiable assets | 150,415 |  |  |  | 135,219 |  |  |  | 150,415 | 135,219 | 78,974
Africa [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 15,127 | 20,194 | 13,877
Transfers between geographic areas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Identifiable assets | 9,063 |  |  |  | 13,700 |  |  |  | 9,063 | 13,700 | 11,653
Asia and other [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 28,037 | 14,255 | 6,360
Transfers between geographic areas |  |  |  |  |  |  |  |  | 0 | 0 | 0
Identifiable assets | 46,351 |  |  |  | 31,902 |  |  |  | 46,351 | 31,902 | 12,679
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Identifiable assets | $ 64 |  |  |  | $ 0 |  |  |  | $ 64 | $ 0 | $ 0

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