Revenue Recognition (Schedule Of Contract Liabilities From Contract With Customers) (Details) $ in Thousands |
3 Months Ended |
|---|---|
|
Mar. 31, 2018
USD ($)
| |
| Organization, Consolidation, And Basis Of Presentation [Abstract] | |
| Contract liabilities at beginning of period | $ 14,417 |
| Increase due to deferral of revenue | 13,444 |
| Decreases due to recognition of revenue | (12,965) |
| Contract liabilities at end of period | $ 14,896 |
| 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/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Contract with Customer, Liability, Increase (Decrease) In Deferred Revenue No definition available.
|
| X | ||||||||||
- Definition Contract with Customer, Liability, Increase (Decrease) Revenue Recognized No definition available.
|