Long Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Total long-term debt	$ 143,509	$ 195,615
Current portion of long-term debt	54,557	110,433
Long-term debt	88,952	85,182
Term Loan [Member]
Debt Instrument [Line Items]
Total long-term debt	53,588	54,938
Revolving Line of Credit [Member]
Debt Instrument [Line Items]
Total long-term debt	80,000	22,000
Convertible Subordinated Debt [Member]
Debt Instrument [Line Items]
Total long-term debt	327	108,189
Mortgages Notes [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 9,594	$ 10,488