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Fair Value Measurement (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Cash equivalents:    
Total assets at fair value on a recurring basis $ 100 $ 8,418
Other liabilities:    
Total liabilities at fair value on a recurring basis 3,032 2,398
Money market funds [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis 100 8,275
Deferred payments [Member]    
Other liabilities:    
Total liabilities at fair value on a recurring basis 3,032 2,398
Interest rate swap [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis   143
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis $ 100 $ 8,275
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 $ 100 $ 8,275
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 swap [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis
Significant Other Observable Inputs (Level 2) [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis $ 143
Other liabilities:    
Total liabilities at fair value on a recurring basis  
Significant Other Observable Inputs (Level 2) [Member] | Money market funds [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis
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 swap [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis   $ 143
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 $ 3,032 $ 2,398
Significant Unobservable Inputs (Level 3) [Member] | Money market funds [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis
Significant Unobservable Inputs (Level 3) [Member] | Deferred payments [Member]    
Other liabilities:    
Total liabilities at fair value on a recurring basis $ 3,032 $ 2,398
Significant Unobservable Inputs (Level 3) [Member] | Interest rate swap [Member]    
Cash equivalents:    
Total assets at fair value on a recurring basis