Acquisition of Gordon Trucking, Inc. Total Purchase Price Consideration (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Acquisition of Gordon Trucking, Inc [Abstract]
Payments to Acquire Businesses, Gross	$ 115,900
Payments to Acquire Intangible Assets	15,000
Cash Acquired from Acquisition	(20,000)
Payments to Acquire Businesses, Net of Cash Acquired	110,900	0	0
Business Combination, Acquisition Related Costs	148,000
Common stock issued (par value of $0.01)	41,100
Total acquisition purchase price	$ 300,000