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Equity Compensation And Employee Benefit Plans (Schedule of Equity Compensation Performance Shares Valuation Assumptions) (Details) (Performance Shares, USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Performance Shares
  
Schedule of Share Based Payment Award Performance Shares Valuation Assumptions [Abstract]  
Number of Shares granted 183wern_EquityCompensationArrangementbySharebasedPaymentAwardPerformanceAwardsNonvestedGrantsinPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Dividends per share (quarterly amounts) $ 0.05wern_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformanceSharesFairValueAssumptionsExpectedDividendPaymentsPerShare
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Risk-free interest rate 1.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember