Long-term Debt (Details) (USD $)
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12 Months Ended | 12 Months Ended | |||||||||||||||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2012
Buildings [Member]
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Dec. 31, 2011
Buildings [Member]
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Dec. 31, 2012
Vehicles [Member]
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Dec. 31, 2011
Vehicles [Member]
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Dec. 31, 2012
Machinery and Equipment [Member]
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Dec. 31, 2011
Machinery and Equipment [Member]
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Dec. 31, 2012
Capital Leases Member
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Dec. 31, 2012
Other Long-term Debt Member
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Dec. 31, 2012
Revolving Facility [Member]
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Dec. 31, 2011
Revolving Facility [Member]
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Dec. 31, 2012
Private Placement [Member]
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Dec. 31, 2011
Private Placement [Member]
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Dec. 31, 2012
Private Placement [Member]
Private Placement Notes Seriesa [Member]
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Dec. 31, 2012
Private Placement [Member]
Private Placement Notes Series B [Member]
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Dec. 31, 2012
Other Non-US Dollar-denominated Facilities [Member]
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Dec. 31, 2011
Other Non-US Dollar-denominated Facilities [Member]
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Dec. 31, 2012
Dominion Terminal Associates Bonds [Member]
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Dec. 31, 2011
Dominion Terminal Associates Bonds [Member]
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Dec. 31, 2012
Captial Lease Interest Rate Information [Member]
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Dec. 31, 2011
Captial Lease Interest Rate Information [Member]
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Long-term Debt Types [Abstract] | |||||||||||||||||||||||
Bank Credit Facility | $ 107,200,000 | $ 110,000,000 | $ 100,000,000 | $ 100,000,000 | $ 20,900,000 | $ 15,400,000 | |||||||||||||||||
Dominion Terminal Associates Bonds | 43,200,000 | 43,200,000 | |||||||||||||||||||||
Captial lease arrangments | 18,100,000 | 43,000,000 | 33,900,000 | 91,300,000 | 95,400,000 | ||||||||||||||||||
Total Long-Term Debt | 362,600,000 | 364,000,000 | |||||||||||||||||||||
Long Term Debt By Current And Noncurrent [Abstract] | |||||||||||||||||||||||
Current maturities of long-term debt | 27,000,000 | 28,700,000 | |||||||||||||||||||||
Long-term debt | 335,600,000 | 335,300,000 | |||||||||||||||||||||
Total Long-Term Debt | 362,600,000 | 364,000,000 | |||||||||||||||||||||
Interest Rate And Other Disclosures [Abstract] | |||||||||||||||||||||||
Average Interest Rate | 1.50% | 2.10% | 4.57% | 5.20% | 6.30% | 6.90% | 6.00% | 4.20% | 4.30% | ||||||||||||||
Debt Due Date | Jan. 01, 2021 | Jan. 01, 2033 | |||||||||||||||||||||
Minimum Repayments of Long-term Debt [Line Items] | |||||||||||||||||||||||
2013 | 27,000 | 20,900 | 6,100 | ||||||||||||||||||||
2014 | 28,800 | 19,100 | 9,700 | ||||||||||||||||||||
2015 | 27,300 | 17,700 | 9,600 | ||||||||||||||||||||
2016 | 21,200 | 13,300 | 7,900 | ||||||||||||||||||||
2017 | 124,900 | 10,200 | 114,700 | ||||||||||||||||||||
Later years | 133,400 | 10,100 | 123,300 | ||||||||||||||||||||
Borrowed Funds | 362,600 | 91,300 | 271,300 | ||||||||||||||||||||
Captial Leases [Line Items] | |||||||||||||||||||||||
Capital Leased Assets Gross | 149,600 | 133,200 | 4,900 | 6,000 | 108,200 | 89,900 | 36,500 | 37,300 | |||||||||||||||
Accumulated Amortization | 47,400 | 30,000 | |||||||||||||||||||||
Total | $ 102,200 | $ 103,200 |