US Flag Senior Credit Facility (Details) (USD $)	9 Months Ended		3 Months Ended	9 Months Ended				0 Months Ended
	Sep. 30, 2013	Sep. 24, 2013	Sep. 30, 2013 Senior Secured Credit Facility [Member]	Sep. 30, 2013 Senior Secured Credit Facility [Member]	Sep. 24, 2013 Senior Secured Credit Facility [Member] item	Sep. 24, 2013 Standby Letters of Credit [Member]	Sep. 24, 2013 Swingline Loans [Member]	Sep. 24, 2013 Old Line Of Credit Facility [Member]	Sep. 24, 2013 Variable Rate Financing Agreement [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 45,000,000
Line of credit		50,000,000				20,000,000	5,000,000
Number of lenders					4
Lender commitments, minimum					15,000,000
Lender commitments, maximum					30,000,000
Amount of additional term loan					50,000,000
Variable rate financing agreement term	5 years
Total amount paid off								46,600,000
Amount drawn from line of credit									21,000,000
Bank fees				1,400,000
Third party fees				148,000
Line of credit facility, expenses			$ 800,000