Liquidity (Risks and Uncertainties) (Details) (USD $)	6 Months Ended			6 Months Ended					6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Other Postretirement Benefit Plans, Defined Benefit [Member]	Jun. 30, 2014 Multiemployer Plans, Pension [Member]	Jun. 30, 2014 2014 ABL Facility Credit Agreement [Member] [Member]	Mar. 31, 2014 2014 ABL Facility Credit Agreement [Member] [Member]	Jun. 30, 2014 ABL Facility Credit Agreement [Member]	Jun. 30, 2014 Revenue Equipment [Member]	Jun. 30, 2014 2014 ABL Facility Credit Agreement [Member] [Member] Line of Credit [Member]		Mar. 31, 2014 2014 ABL Facility Credit Agreement [Member] [Member] Line of Credit [Member]
Risks and Uncertainties [Line Items]
Total availability						$ 253,200,000.0	$ 223,000,000.0			$ 79,300,000
Line Of Credit Facility, Total Cash and Able to Be Drawn										209,400,000		183,200,000
Net cash used in operating activities	55,600,000	18,200,000
Minimum availability of the lesser of the aggregate amount of commitments from lenders or the borrowing base								10.00%
Long-term Debt, Gross	1,208,900,000		1,361,300,000							0	[1]
Defined Benefit Plan, Estimated Benefit Obligation for Remaining Fiscal Year				49,400,000	46,100,000
Operating Leases, Future Minimum Payments, Due Remainder of Fiscal Year	28,800,000
Operating Leases, Future Minimum Payments Due	154,800,000
Payments to Acquire Property, Plant, and Equipment	24,700,000	39,100,000
Operating lease commitment									$ 7,000,000
Operating lease term									3 years

[1] As of June 30, 2014, the borrowing base and availability on our New ABL Facility were $446.8 million and $79.3 million, respectively. The availability is calculated in accordance with the terms of the New ABL Facility and is derived by reducing the borrowing base by our $367.5 million of outstanding letters of credit as of June 30, 2014. The amount which is actually able to be drawn is limited by certain financial covenants in the New ABL Facility to $35.5 million. In comparison, the borrowing base, availability and amount able to be drawn as of March 31, 2014 were $450.0 million, $82.5 million and $42.7 million, respectively.