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Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Cash equivalents:
Total assets at fair value on a recurring basis	$ 8,381	$ 1,380
Other liabilities:
Total liabilities at fair value on a recurring basis	2,147	3,330
Money Market Funds [Member]
Cash equivalents:
Total assets at fair value on a recurring basis	8,381	1,380
Interest Rate Swaps [Member]
Other liabilities:
Total liabilities at fair value on a recurring basis	31	1,211
Deferred Payments [Member]
Other liabilities:
Total liabilities at fair value on a recurring basis	2,116	2,119
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Cash equivalents:
Total assets at fair value on a recurring basis	8,381	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] \| Money Market Funds [Member]
Cash equivalents:
Total assets at fair value on a recurring basis	8,381	1,380
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] \| Interest Rate Swaps [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	31	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 Other Observable Inputs (Level 2) [Member] \| Interest Rate Swaps [Member]
Other liabilities:
Total liabilities at fair value on a recurring basis	31	1,211
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	2,116	2,119
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 Swaps [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	$ 2,116	$ 2,119