Annual report pursuant to Section 13 and 15(d)

Acquisitions (Pro Forma Information) (Details)

v3.6.0.2
Acquisitions (Pro Forma Information) (Details) - Aviation - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Revenue $ 541,387 $ 536,867
Income from continuing operations $ 25,267 $ 26,040
Basic earning per share (in dollars per share) $ 2.35 $ 2.43
Diluted earning per share (in dollars per share) $ 2.34 $ 2.42