Accounts Receivable Securitization (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Subordinated Debt	$ 23,970		$ 48,945
Line of Credit Facility, Collateral Fees, Amount	484	913
Proceeds from Accounts Receivable Securitization		2,873
AR securitization facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	125,000
Current borrowing capacity of receivable facility	85,900		115,000
Letters of credit amount outstanding	$ 61,930
Expiration date of receivables facility	Mar. 30, 2015