XML 42 R27.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Schedule II - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts |
(In thousands) | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Write-offs (Recoveries) of Doubtful Accounts |  | Balance at End of Period
Year ended December 31, 2017: |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 9,183 |  |  | $ | 184 |  |  | $ | 1,117 |  |  | $ | 8,250 |
Year ended December 31, 2016: |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 10,298 |  |  | $ | (245 | ) |  | $ | 870 |  |  | $ | 9,183 |
Year ended December 31, 2015: |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 10,017 |  |  | $ | 692 |  |  | $ | 411 |  |  | $ | 10,298 |
(In thousands) | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Write-offs (Recoveries) of Doubtful Accounts |  | Balance at End of Period
Year ended December 31, 2017: |  |  |  |  |  |  |
Allowance for doubtful student notes | $ | 15,682 |  |  | $ | 15,917 |  |  | $ | 10,573 |  |  | $ | 21,026 |
Year ended December 31, 2016: |  |  |  |  |  |  |
Allowance for doubtful student notes | $ | 8,622 |  |  | $ | 19,019 |  |  | $ | 11,959 |  |  | $ | 15,682 |
Year ended December 31, 2015: |  |  |  |  |  |  |
Allowance for doubtful student notes | $ | 17,603 |  |  | $ | 12,595 |  |  | $ | 21,576 |  |  | $ | 8,622 |

X
- References No definition available. + Details
Name: | us-gaap_ValuationAndQualifyingAccountsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of allowance and reserve accounts including their beginning and ending balances, as well as a reconciliation by type of activity during the period. + References No definition available. + Details
Name: | wern_ScheduleOfValuationAndQualifyingAccountsTableTextBlock
Namespace Prefix: | wern_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration