Revenue Recognition (Contract Balances) (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Changes in contract liabilities | ||
| Balance at Beginning of Period | $ 2,187 | $ 2,006 |
| Additions | 14,931 | 16,082 |
| Deductions | (14,372) | (15,901) |
| Balance at End of Period | 2,746 | 2,187 |
| Contract assets | $ 0 | $ 0 |
| Revenue, Practical Expedient, Incremental Cost of Obtaining Contract | True | |
| Optional exemption, performance obligation | True | |
| X | ||||||||||
- Definition Amount of increase in obligation to transfer good or service to customer for which consideration from customer has been received or is due. No definition available.
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| X | ||||||||||
- Definition Amount of (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due. No definition available.
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| X | ||||||||||
- Definition Indicates (true false) whether optional exemption was applied not to disclose amount of transaction price allocated to and explanation of expected timing of revenue recognition for remaining performance obligation, when contract has expected duration of one year or less or right to consideration corresponds directly to performance completed. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Description of consideration that is not included in transaction price and not allocated to remaining performance obligation. Includes, but is not limited to, variable consideration that is constrained. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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