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Other Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Equity Method Investments [Line Items] |  |  |
Impairment charge other asset | $ (911) | $ (1,134) |
Patents [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Accumulated amortization | (3,075) | (2,826) | (200)
Estimated accumulated amortization, 2014 | 200 |  |
Estimated accumulated amortization, 2015 | 200 |  |
Estimated accumulated amortization, 2016 | 200 |  |
Estimated accumulated amortization, 2017 | 200 |  |
Estimated accumulated amortization, 2018 | 200 |  |
Software development [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Accumulated amortization | $ (969) | $ (498) | $ (100)
Crossbow manufacturer [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest | 29.00% |  |

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