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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of assets and liabilities measured at fair value on recurring basis    
Interest rate swaps $ 542 [1] $ 510 [1]
Level 1
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Interest rate swaps 0 [1] 0 [1]
Level 2
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Interest rate swaps 542 [1] 510 [1]
Level 3
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Interest rate swaps 0 [1] 0 [1]
Money market mutual funds
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 9,921 [2] 8,818 [2]
Money market mutual funds | Level 1
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 9,921 [2] 8,818 [2]
Money market mutual funds | Level 2
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 0 [2] 0 [2]
Money market mutual funds | Level 3
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 0 [2] 0 [2]
Government agency bonds
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 6,817 [2] 9,015 [2]
Government agency bonds | Level 1
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 6,817 [2] 9,015 [2]
Government agency bonds | Level 2
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 0 [2] 0 [2]
Government agency bonds | Level 3
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 0 [2] 0 [2]
United States treasuries
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 6,089 [2] 0
United States treasuries | Level 1
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 6,089 [2] 0
United States treasuries | Level 2
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 0 [2] 0
United States treasuries | Level 3
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 0 [2] 0
Corporate notes
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 4,679 [2] 3,019 [2]
Corporate notes | Level 1
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 4,679 [2] 3,019 [2]
Corporate notes | Level 2
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 0 [2] 0 [2]
Corporate notes | Level 3
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 0 [2] 0 [2]
Certificates of deposit
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 1,800 [2] 2,701 [2]
Certificates of deposit | Level 1
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 1,800 [2] 2,701 [2]
Certificates of deposit | Level 2
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value 0 [2] 0 [2]
Certificates of deposit | Level 3
    
Schedule of assets and liabilities measured at fair value on recurring basis    
Assets measured at fair value $ 0 [2] $ 0 [2]
[1] The valuations of the interest rate swaps intended to mitigate the Company’s interest rate risk are determined with the assistance of a third-party financial institution using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each instrument. This analysis utilizes observable market-based inputs, including interest rate curves and interest rate volatility, and reflects the contractual terms of these instruments, including the period to maturity.
[2] Market approach—prices and other relevant information generated by market transactions involving identical or comparable assets