Debt (Details) (USD $)	3 Months Ended						3 Months Ended		3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 UNITED STATES	Mar. 31, 2014 Domestic Line of Credit [Member] Letter of Credit [Member]	Dec. 31, 2013 Domestic Line of Credit [Member] Letter of Credit [Member]	Mar. 31, 2014 Pnc Bank [Member] Revolving Credit Facility [Member]	Mar. 31, 2014 Pnc Bank [Member] Revolving Credit Facility [Member] UNITED STATES	Mar. 31, 2014 Pnc Bank [Member] Revolving Credit Facility [Member] UNITED STATES	Mar. 31, 2014 Pnc Bank [Member] Letter of Credit [Member] UNITED STATES	Mar. 31, 2014 Pnc Bank [Member] Secured Debt [Member] UNITED STATES	Dec. 31, 2013 Pnc Bank [Member] Secured Debt [Member] UNITED STATES	Mar. 31, 2014 London Interbank Offered Rate (LIBOR) [Member] Pnc Bank [Member] Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving line of credit maximum borrowing capacity							$ 34,000,000		$ 10,000,000	$ 10,500,000	$ 15,000,000
Description of variable rate basis												LIBOR
Revolving Credit and Security Agreement expiring date									Dec. 11, 2018
Debt issuance cost	200,000	0	400,000
Remaining fees associated with original agreement			100,000
Debt fees amortization term			5 years
Unused capacity, commitment fee percentage							0.375%
Consolidated borrowings								4,200,000
Outstanding letters of credit				3,400,000	3,200,000
Remaining borrowing capacity						$ 9,600,000