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Common Stock and Stock Compensation - Compensation Costs Not Yet Recognized (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expense not yet recognized $ 348us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted-Average Remaining Term (in years) 2 years 3 months 29 days
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expense not yet recognized $ 887us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Weighted-Average Remaining Term (in years) 2 years 1 month 28 days