Quarterly report pursuant to Section 13 or 15(d)

Fair Value Disclosures - Financial Assets and Liabilities Measured at Fair Value (Details)

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Fair Value Disclosures - Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
SERP $ 1,818 $ 2,778
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
SERP 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
SERP 1,818 2,778
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
SERP $ 0 $ 0