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Significant Accounting Policies (Activity in Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
 [1]
Credit Loss [Abstract]      
Balance at beginning of period $ 962 $ 945 [1] $ 18,749
Provision for doubtful accounts 918 343 272
Deductions [2] 907 326 18,076
Balance at end of period $ 973 $ 962 $ 945
[1] With the adoption of ASU 2014-09, Revenue from Contracts with Customers, in 2018 and subsequent periods, subsequent adjustments that are determined to be the result of an adverse change in the payor’s ability to pay are recognized as provision for doubtful accounts. We recorded $18.0 million for the year ended December 31, 2018 as a reduction to revenue that would have been recorded as provision for doubtful accounts under the prior revenue recognition guidance.
[2] Write-offs, net of recoveries