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Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Cash equivalents:
Total assets at fair value on a recurring basis	$ 1,380	$ 7,606
Other liabilities:
Total liabilities at fair value on a recurring basis	3,049	3,210
Money Market Funds [Member]
Cash equivalents:
Total assets at fair value on a recurring basis	1,380	7,606
Interest Rate Swap [Member]
Other liabilities:
Total liabilities at fair value on a recurring basis	896	1,010
Deferred Payments [Member]
Other liabilities:
Total liabilities at fair value on a recurring basis	2,153	2,200
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Cash equivalents:
Total assets at fair value on a recurring basis	1,380	7,606
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	1,380	7,606
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] \| Interest Rate Swap [Member]
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
Significant Other Observable Inputs (Level 2) [Member]
Cash equivalents:
Total assets at fair value on a recurring basis
Other liabilities:
Total liabilities at fair value on a recurring basis	896	1,010
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] \| Interest Rate Swap [Member]
Other liabilities:
Total liabilities at fair value on a recurring basis	896	1,010
Significant Other Observable Inputs (Level 2) [Member] \| Deferred Payments [Member]
Other liabilities:
Total liabilities 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	2,153	2,200
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] \| Interest Rate Swap [Member]
Other liabilities:
Total liabilities 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	$ 2,153	$ 2,200