Long-term Debt	6 Months Ended
Jun. 30, 2012
Long-term Debt [Abstract]
Long-Term Debt	6. Long-term debt On June 4, 2012, the Company entered into a senior revolving credit agreement (the “Credit Agreement”) with certain financial institutions from time to time party thereto as lenders, Wells Fargo Bank, National Association, as Administrative Agent, Swingline Lender and an Issuing Lender, Bank of America, N.A., as Syndication Agent and PNC Bank, National Association, BMO Harris Bank N.A. and Fifth Third Bank, as Co-Documentation Agents. The Credit Agreement, which replaced the Company’s former revolving credit agreement, provides for a senior revolving credit facility in an aggregate principal amount of up to $175,000, subfacilities for the issuance of standby letters of credit up to a $125,000 sublimit, multicurrency borrowings up to a $50,000 sublimit and swingline loans up to a $10,000 sublimit. The Credit Agreement also includes an incremental loans feature that will allow the Company to increase the senior revolving credit facility by an aggregate principal amount of up to $50,000. This is subject to lenders providing incremental commitments for such increase, provided that no default or event of default exists, the Company will be in pro forma compliance with the existing financial covenants both before and after giving effect to the increase and other standard conditions. The prior credit agreement with Bank of America N.A. was terminated. Depending on the Company’s consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the new revolving credit facility will bear interest at the option of the Company of either a LIBOR rate plus a margin of between 1.50% to 2.50% per annum or a base rate plus a margin of between 0.50% to 1.50%. The revolving credit facility is an unsecured facility and will remain unsecured provided the Company maintains a total leverage ratio less than or equal to 3.75 to 1.00 as of the end of each fiscal quarter. If the leverage ratio exceeds 3.75 to 1.00, or an event of default occurs and is not cured within the applicable grace period, the revolving credit facility will cease to remain unsecured. In the event of the facility becomes secured, outstanding obligations shall be automatically secured by certain vessels and all domestic accounts receivable, subject to the liens and interests of other parties (including the Company’s bonding provider) holding first priority perfected liens. The new credit facility contains affirmative, negative and financial covenants customary for financings of this type. The Credit Agreement also contains customary events of default (including non-payment of principal or interest on any material debt and breaches of covenants) as well as events of default relating to certain actions by the Company’s surety bonding provider. At June 30, 2012 the Company was in compliance with its debt covenants.

On June 4, 2012, the Company entered into a senior revolving credit agreement (the “Credit Agreement”) with certain financial institutions from time to time party thereto as lenders, Wells Fargo Bank, National Association, as Administrative Agent, Swingline Lender and an Issuing Lender, Bank of America, N.A., as Syndication Agent and PNC Bank, National Association, BMO Harris Bank N.A. and Fifth Third Bank, as Co-Documentation Agents. The Credit Agreement, which replaced the Company’s former revolving credit agreement, provides for a senior revolving credit facility in an aggregate principal amount of up to $175,000, subfacilities for the issuance of standby letters of credit up to a $125,000 sublimit, multicurrency borrowings up to a $50,000 sublimit and swingline loans up to a $10,000 sublimit. The Credit Agreement also includes an incremental loans feature that will allow the Company to increase the senior revolving credit facility by an aggregate principal amount of up to $50,000. This is subject to lenders providing incremental commitments for such increase, provided that no default or event of default exists, the Company will be in pro forma compliance with the existing financial covenants both before and after giving effect to the increase and other standard conditions. The prior credit agreement with Bank of America N.A. was terminated.

Depending on the Company’s consolidated leverage ratio (as defined in the Credit Agreement), borrowings under the new revolving credit facility will bear interest at the option of the Company of either a LIBOR rate plus a margin of between 1.50% to 2.50% per annum or a base rate plus a margin of between 0.50% to 1.50%.

The revolving credit facility is an unsecured facility and will remain unsecured provided the Company maintains a total leverage ratio less than or equal to 3.75 to 1.00 as of the end of each fiscal quarter. If the leverage ratio exceeds 3.75 to 1.00, or an event of default occurs and is not cured within the applicable grace period, the revolving credit facility will cease to remain unsecured. In the event of the facility becomes secured, outstanding obligations shall be automatically secured by certain vessels and all domestic accounts receivable, subject to the liens and interests of other parties (including the Company’s bonding provider) holding first priority perfected liens.

The new credit facility contains affirmative, negative and financial covenants customary for financings of this type. The Credit Agreement also contains customary events of default (including non-payment of principal or interest on any material debt and breaches of covenants) as well as events of default relating to certain actions by the Company’s surety bonding provider. At June 30, 2012 the Company was in compliance with its debt covenants.