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Other Assets (Schedule of Other Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Patents, at cost $ 6,322 $ 6,113
Accumulated amortization (3,629) (3,364)
Deposits on capital items 16,839 19,011
Software development costs, at cost 2,057 2,057
Accumulated amortization (1,792) (1,381)
Other 2,994 3,111
Other assets $ 22,791 $ 25,547