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Revenue Recognition and Contracts with Customers (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]    
Deferred contract liability $ 21,200  
Revenue previously deferred 20,700  
Accrued liability   $ 4,000
Deferred contract liability 7,400
Increase in deferred contract liability   6,900
Decrease in accounts payable and accrued expenses   4,000
Increase in deferred tax asset   700
Decrease in retained earnings   $ (2,200)
Net increase in firearms sales 500  
Promotional expenses $ 12,100  
Gross margin reduced 3.00%