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Other Assets (Schedule of Other Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Patents, at cost $ 6,525 $ 6,322
Accumulated amortization (3,915) (3,629)
Deposits on capital items 21,436 16,839
Software development costs, at cost   2,057
Accumulated amortization   (1,792)
Other 3,495 2,994
Other assets $ 27,541 $ 22,791