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Business Segments (Long Lived Asset by Geography) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Revenues from External Customers and Long-Lived Assets |  |  |
Long-lived assets | $ 96,096 | $ 103,973 | $ 126,745
United States |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Long-lived assets | 89,439 | 96,650 | 118,053
Canada |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Long-lived assets | 4,788 | 5,445 | 6,186
United Kingdom |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Long-lived assets | 1,850 | 1,842 | 2,449
Other |  |  |
Revenues from External Customers and Long-Lived Assets |  |  |
Long-lived assets | $ 19 | $ 36 | $ 57

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