Long-Term Obligations (Details 1)	6 Months Ended
	Jun. 30, 2012
Level One [Member]
Summary of Leverage ratios in effect from time to time
Leverage Ratio	≥ 2.50:1.00
Debt Instrument, Basis Spread on Variable Rate	2.25%
Applicable Revolving Commitment Fee %	0.50%
Level Two [Member]
Summary of Leverage ratios in effect from time to time
Leverage Ratio	< 2.50:1.00 and ≥ 1.75:1.00
Debt Instrument, Basis Spread on Variable Rate	1.75%
Applicable Revolving Commitment Fee %	0.375%
Level Three [Member]
Summary of Leverage ratios in effect from time to time
Leverage Ratio	< 1.75:1.00 and ≥ 1.00:1.00
Debt Instrument, Basis Spread on Variable Rate	1.50%
Applicable Revolving Commitment Fee %	0.25%
Level Four [Member]
Summary of Leverage ratios in effect from time to time
Leverage Ratio	< 1.00:1.00
Debt Instrument, Basis Spread on Variable Rate	1.25%
Applicable Revolving Commitment Fee %	0.20%