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Equity-based Compensation - Director Stock Plan (Details)
12 Months Ended
Dec. 31, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares issued in period (shares) 45,000
Director Stock Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares available for future issuance (shares) 99,000