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Geographic Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Geographic information [Line Items]      
Revenues $ 295,566 $ 311,363 $ 457,641
Identifiable assets 742,932 786,140 966,627
U.S. [Member]      
Geographic information [Line Items]      
Revenues 265,311 270,828 411,028
Identifiable assets 691,588 733,077 907,028
Latin America [Member]      
Geographic information [Line Items]      
Revenues 23,493 32,673 36,843
Identifiable assets 45,170 48,303 54,362
Canada [Member]      
Geographic information [Line Items]      
Revenues 3,678 2,666 4,282
Identifiable assets 4,278 2,895 2,307
Other [Member]      
Geographic information [Line Items]      
Revenues 3,084 5,196 5,488
Identifiable assets $ 1,896 $ 1,865 $ 2,930