Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2019 |
Dec. 31, 2018 |
|
| Revenue Recognition | ||
| Customer contract period | 90 days | |
| Contract Liabilities | ||
| Deferred revenue | $ 17,261 | $ 19,963 |
| Receivables, net | ||
| Contract Assets | ||
| Receivables, unbilled | 55,173 | 61,339 |
| Accrued liabilities | ||
| Contract Liabilities | ||
| Deferred revenue | $ 17,261 | $ 19,963 |
| X | ||||||||||
- Definition The general duration of contracts with customers. No definition available.
|
| X | ||||||||||
- Definition Revenue Recognition Disclosure [Abstract]. No definition available.
|
| 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, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|