Accrued Expenses and Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accrued Expenses and Other Liabilities
Salaries and wages, Accrued Expenses	$ 80,338	$ 86,776
Salaries and wages, Non-Current Liabilities	0	0
Salaries and wages, Total	80,338	86,776
Deferred compensation, Accrued Expenses	1,780	1,630
Deferred compensation, Non-Current Liabilities	27,478	24,918
Deferred compensation, Total	29,258	26,548
Pension benefits, Accrued Expenses	3,279	3,309
Pension benefits, Non-Current Liabilities	586,427	597,275
Pension benefits, Total	589,706	600,584
Other postretirement benefits, Accrued Expenses	2,670	2,683
Other postretirement benefits, Non-Current Liabilities	36,518	37,916
Other postretirement benefits, Total	39,188	40,599
Insurance obligations, primarily self-insurance, Accrued Expenses	128,131	133,459
Insurance obligations, primarily self-insurance, Non-Current Liabilities	184,157	178,714
Insurance obligations, primarily self-insurance, Total	312,288	312,173
Residual value guarantees, Accrued Expenses	1,485	1,505
Residual value guarantees, Non-Current Liabilities	239	130
Residual value guarantees, Total	1,724	1,635
Accrued rent, Accrued Expenses	17,371	9,244
Accrued rent, Non-Current Liabilities	6,152	9,405
Accrued rent, Total	23,523	18,649
Environmental liabilities, Accrued Expenses	4,361	4,201
Environmental liabilities, Non-Current Liabilities	7,988	8,415
Environmental liabilities, Total	12,349	12,616
Asset retirement obligations, Accrued Expenses	5,372	3,642
Asset retirement obligations, Non-Current Liabilities	15,324	17,116
Asset retirement obligations, Total	20,696	20,758
Operating taxes, Accrued Expenses	87,204	91,419
Operating taxes, Non-Current Liabilities	0	0
Operating taxes, Total	87,204	91,419
Income taxes, Accrued Expenses	1,694	8,288
Income taxes, Non-Current Liabilities	60,081	57,590
Income taxes, Total	61,775	65,878
Interest, Accrued Expenses	32,742	35,798
Interest, Non-Current Liabilities	0	0
Interest, Total	32,742	35,798
Deposits, mainly from customers, Accrued Expenses	52,285	51,671
Deposits, mainly from customers, Non-Current Liabilities	6,238	6,236
Deposits, mainly from customers, Total	58,523	57,907
Deferred revenue, Accrued Expenses	20,916	21,557
Deferred revenue, Non-Current Liabilities	0	0
Deferred revenue, Total	20,916	21,557
Acquisition holdbacks, Accrued Expenses	2,815	1,637
Acquisition holdbacks, Non-Current Liabilities	0	2,673
Acquisition Holdbacks	2,815	4,310
Other, Accrued Expenses	36,859	48,888
Other, Non-Current Liabilities	9,080	8,544
Other, Total	45,939	57,432
Total Accrued Expenses	479,302	505,707
Total, Non-Current Liabilities	939,682	948,932
Total	$ 1,418,984	$ 1,454,639