Long Term Obligations (Details 2)	12 Months Ended
	Dec. 31, 2012
Summary of Leverage Ratio in effect from time to time
Leverage Ratio	2.03
Applicable Margin for Eurodollar Rate Loans	1.75%
Level One [Member]
Summary of Leverage Ratio in effect from time to time
Leverage Ratio	≥ 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	< 2.50:1.00 and ≥ 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	< 1.75:1.00 and ≥ 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	< 1.00:1.00
Applicable Margin for Eurodollar Rate Loans	1.25%
Applicable Revolving Commitment Fee %	0.20%