Long Term Obligations (Details 2)	12 Months Ended
	Dec. 31, 2011
Level One [Member]
Summary of Leverage Ratio in effect from time to time
Leverage Ratio	Greater than or equal to 2.50:1.00
Applicable Margin for Eurodollar Rate Loans	2.25%
Applicable Revolving Commitment Fee %	0.50%
Level Two [Member]
Summary of Leverage Ratio in effect from time to time
Leverage Ratio	Less than 2.50:1.00 and Greater than or equal to 1.75:1.00
Applicable Margin for Eurodollar Rate Loans	1.75%
Applicable Revolving Commitment Fee %	0.375%
Level Three [Member]
Summary of Leverage Ratio in effect from time to time
Leverage Ratio	Less than 1.75:1.00 and Greater than or equal to 1.00:1.00
Applicable Margin for Eurodollar Rate Loans	1.50%
Applicable Revolving Commitment Fee %	0.25%
Level Four [Member]
Summary of Leverage Ratio in effect from time to time
Leverage Ratio	Less than 1.00:1.00
Applicable Margin for Eurodollar Rate Loans	1.25%
Applicable Revolving Commitment Fee %	0.20%