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Revenue Recognition (Deferred Revenue) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue Recognition [Abstract]      
Balance at beginning of period $ 59,915,000 $ 45,760,000 $ 26,157,000
New contracts sold 49,565,000 35,610,000 31,617,000
Balance at end of period 81,555,000 59,915,000 45,760,000
Deferred Revenue, Revenue Recognized (27,925,000) (21,455,000) $ (12,014,000)
Deferred Revenue, Current 34,254,000 25,777,000  
Deferred Revenue, Noncurrent $ 47,301,000 $ 34,138,000