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Number of requests for the conversion of debt during the period.

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Percent the Senior Exchangable Notes are trading above the face value.

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Performance bonds not under the credit facility.

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The component of interest expense representing the noncash expenses charged against earnings in the period to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate caption: Noncash Interest Expense.

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Interest rate stated in the contractual debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Debt Level 4 (Details) (USD $)	3 Months Ended		9 Months Ended
Debt Level 4 (Details) (USD $)	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Debt Instrument [Line Items]
Loss on exchange of Senior Exchangeable Notes	$ (31,000)	$ (675,000)	$ (870,000)	$ (675,000)
Line of Credit Facility, Current Borrowing Capacity	300,000,000		300,000,000
Line of Credit Facility, Maximum Borrowing Capacity	350,000,000		350,000,000
Performance bonds under credit facility	15,600,000		15,600,000
Line of Credit Facility, Remaining Borrowing Capacity	279,400,000		279,400,000
Performance Bonds	11,100,000		11,100,000
Long-term Debt	239,586,000	147,543,000	239,586,000	147,543,000
Long-term Debt, Excluding Current Maturities	155,093,000	0	155,093,000	0
Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%		1.50%
Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%		2.25%
Debt Conversion Requested 2 [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
NumberOfRequestsForConversionOfDebt		5
NumberOfDebtInstrumentsConverted			16,900
Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt	5,000,000	0	5,000,000	0
Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	300,000,000		300,000,000
Debt Instrument, Maturity Date			Oct. 31, 2011
Debt Instrument, Interest Rate, Stated Percentage	0.25%		0.25%
Debt Instrument, Interest Rate, Effective Percentage	7.48%		7.48%
Debt Instrument, Unamortized Discount	(504,000)		(504,000)		(8,864,000)
Long-term Debt, Gross	84,940,000		84,940,000		156,407,000
Amortization of Debt Discount (Premium)	1,500,000	3,800,000	5,500,000	11,500,000
FaceValueOfDebtPerInstrument			1,000
Debt Instrument, Convertible, Conversion Price	$ 45.41		$ 45.41
Debt Instrument, Convertible, Number of Equity Instruments			22.0221
PercentNotesTradingAboveFaceValue	208.00%		208.00%		197.00%
VarianceTradeValueToFaceValue	91,700,000		91,700,000		151,700,000
Number of Debt Instruments Outstanding	84,940		84,940		156,407
NumberOfRequestsForConversionOfDebt			8
NumberOfDebtInstrumentsConverted			6,990
Debt Conversion, Converted Instrument, Amount			7,000,000
Debt Conversion, Converted Instrument, Shares Issued			89,316
Loss on exchange of Senior Exchangeable Notes			0
Long-term Debt	84,436,000		84,436,000		147,543,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	150,000,000		150,000,000
Long-term Debt	150,000,000	0	150,000,000	0
senior notes series a [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	75,000,000		75,000,000
Debt Instrument, Maturity Date			Sep. 30, 2021
Debt Instrument, Interest Rate, Effective Percentage	4.01%		4.01%
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt	150,000	0	150,000	0
Short-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	84,493,000	147,543,000	84,493,000	147,543,000
Senior Notes Series B [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 75,000,000		$ 75,000,000
Debt Instrument, Maturity Date			Sep. 30, 2023
Debt Instrument, Interest Rate, Effective Percentage	4.11%		4.11%