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Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Cash equivalents:
Total assets at fair value on a recurring basis	$ 3,750	$ 8,427
Other long-term liabilities:
Total liabilities at fair value on a recurring basis	2,167	2,115
Money Market Funds [Member]
Cash equivalents:
Total assets at fair value on a recurring basis	3,449	8,382
Deferred Payments [Member]
Other long-term liabilities:
Total liabilities at fair value on a recurring basis	2,167	2,115
Interest Rate Swaps [Member]
Cash equivalents:
Total assets at fair value on a recurring basis	301	45
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Cash equivalents:
Total assets at fair value on a recurring basis	3,449	8,382
Other long-term 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	3,449	8,382
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] \| Deferred Payments [Member]
Other long-term 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
Significant Other Observable Inputs (Level 2) [Member]
Cash equivalents:
Total assets at fair value on a recurring basis	301	45
Other long-term 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 long-term 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	301	45
Significant Unobservable Inputs (Level 3) [Member]
Cash equivalents:
Total assets at fair value on a recurring basis
Other long-term liabilities:
Total liabilities at fair value on a recurring basis	2,167	2,115
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 long-term liabilities:
Total liabilities at fair value on a recurring basis	2,167	2,115
Significant Unobservable Inputs (Level 3) [Member] \| Interest Rate Swaps [Member]
Cash equivalents:
Total assets at fair value on a recurring basis