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Acquisitions (Pro Forma Information) (Details) - Aviation
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
Business Acquisition [Line Items]  
Revenue | $ $ 541,387
Income from continuing operations | $ $ 25,267
Basic earning per share (in dollars per share) | $ / shares $ 2.35
Diluted earning per share (in dollars per share) | $ / shares $ 2.34