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Fair Value Measurement (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Cash equivalents:    
Total assets at fair value on a recurring basis $ 8,427 $ 1,380
Other liabilities:    
Total liabilities at fair value on a recurring basis 2,115 3,330
Deferred Payments [Member]
    
Other liabilities:    
Total liabilities at fair value on a recurring basis 2,115 2,119
Interest Rate Swaps [Member]
    
Cash equivalents:    
Total assets at fair value on a recurring basis 45  
Other liabilities:    
Total liabilities at fair value on a recurring basis   1,211
Money Market Funds [Member]
    
Cash equivalents:    
Total assets at fair value on a recurring basis 8,382 1,380
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
    
Cash equivalents:    
Total assets at fair value on a recurring basis 8,382 1,380
Other liabilities:    
Total liabilities at fair value on a recurring basis      
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Deferred Payments [Member]
    
Other liabilities:    
Total liabilities at fair value on a recurring basis      
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Interest Rate Swaps [Member]
    
Cash equivalents:    
Total assets at fair value on a recurring basis     
Other liabilities:    
Total liabilities at fair value on a recurring basis     
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Money Market Funds [Member]
    
Cash equivalents:    
Total assets at fair value on a recurring basis 8,382 1,380
Significant Other Observable Inputs (Level 2) [Member]
    
Cash equivalents:    
Total assets at fair value on a recurring basis 45   
Other liabilities:    
Total liabilities at fair value on a recurring basis    1,211
Significant Other Observable Inputs (Level 2) [Member] | Deferred Payments [Member]
    
Other liabilities:    
Total liabilities at fair value on a recurring basis      
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swaps [Member]
    
Cash equivalents:    
Total assets at fair value on a recurring basis 45  
Other liabilities:    
Total liabilities at fair value on a recurring basis   1,211
Significant Other Observable Inputs (Level 2) [Member] | Money Market Funds [Member]
    
Cash equivalents:    
Total assets at fair value on a recurring basis      
Significant Unobservable Inputs (Level 3) [Member]
    
Cash equivalents:    
Total assets at fair value on a recurring basis      
Other liabilities:    
Total liabilities at fair value on a recurring basis 2,115 2,119
Significant Unobservable Inputs (Level 3) [Member] | Deferred Payments [Member]
    
Other liabilities:    
Total liabilities at fair value on a recurring basis 2,115 2,119
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Swaps [Member]
    
Cash equivalents:    
Total assets at fair value on a recurring basis     
Other liabilities:    
Total liabilities at fair value on a recurring basis     
Significant Unobservable Inputs (Level 3) [Member] | Money Market Funds [Member]
    
Cash equivalents:    
Total assets at fair value on a recurring basis