Annual report pursuant to Section 13 and 15(d)

STOCK INCENTIVE PLAN (Narrative) (Details)

v2.4.1.9
STOCK INCENTIVE PLAN (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
EquityPlan
Dec. 31, 2014
OptionPlan
Dec. 31, 2013
Dec. 31, 2012
Employee
EquityPlan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock option plans     1salm_NumberOfStockOptionPlans    
Awards issued to number of employees         2salm_AwardsGrantedToNumberOfEmployees
Number of outstanding accelerated vesting stock awards   2salm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfTypesOfAwards     2salm_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfTypesOfAwards
Accelerated additional compensation cost $ 30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost $ 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost      
Closing stock price $ 7.82us-gaap_SharePrice   $ 7.82us-gaap_SharePrice    
Total fair value of options vested     1,900,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 800,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 1,200,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Total unrecognized compensation cost related to non-vested awards of stock options $ 1,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions   $ 1,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions    
Total unrecognized compensation cost related to non-vested awards of stock options, weighted average recognition period     1 year 5 months 23 days    
Restricted stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation, vesting period     1 year    
Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized under plan 5,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
  5,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option, historical volatility term     6 years    
Minimum [Member] | Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation, vesting period     4 years    
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option, historical volatility term     10 years    
Maximum [Member] | Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, term     5 years