Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Carrying (Reported) Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short term investments	$ 2,998	$ 0
Long term debt	139,874	118,828
Interest rate swaps	2,633	2,469
Estimate of Fair Value, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short term investments	2,998	0
Estimate of Fair Value, Fair Value Disclosure [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	144,223	122,886
Interest rate swaps	$ 2,633	$ 2,469

Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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