Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Nature of Operations and Summary of Significant Accounting Policies (Schedule of Changes in Deferred Revenues Relating to Warranty Commitments) (Details)

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Nature of Operations and Summary of Significant Accounting Policies (Schedule of Changes in Deferred Revenues Relating to Warranty Commitments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Changes in deferred revenues    
Balance at beginning of year $ 15,939 $ 11,779
Revenue deferred in the period 19,413 21,582
Revenue recognized in the period (21,252) (17,422)
Balance at end of year $ 14,100 $ 15,939