Number of Revenue Bonds Redeemed

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- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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-Name Regulation S-X (SX)

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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-Topic 210

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-Topic 210

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- Definition

The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer).

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-Publisher FASB

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-Glossary Financing Activities

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Debt Debt (Schedule of Long-Term Debt) (Details) (USD $)	3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt, including current installments on long-term debt	$ 320,131,000		$ 357,576,000
Less current installments on long-term debt	0		8,413,000
Long-term debt	320,131,000		349,163,000
Number of Revenue Bonds Redeemed	1	3
Repayments of Revenue Bonds	9,000,000
Revenue Bond, fixed rate 5.9% to 6.0%, due 2024 through 2026 [Member]
Debt Instrument [Line Items]
Long-term debt, including current installments on long-term debt	108,005,000		144,627,000
Repayments of Revenue Bonds		27,700,000
Interest Rate, Stated Percentage	7.00%
7.5% Senior Notes, due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, including current installments on long-term debt	148,370,000		148,241,000
Interest Rate, Stated Percentage	7.50%
Debentures, 6.95%, due 2015 [Member]
Debt Instrument [Line Items]
Long-term debt, including current installments on long-term debt	22,494,000		22,493,000
Interest Rate, Stated Percentage	6.95%
Medium-term Notes, fixed rate 8.75% to 8.89%, due 2016 through 2022 [Member]
Debt Instrument [Line Items]
Long-term debt, including current installments on long-term debt	27,250,000		27,250,000
Term Loans, fixed rate 2.95% due 2017 and 3.70% due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, including current installments on long-term debt	12,000,000		12,000,000
Fair value adjustment of hedged debt [Member]
Debt Instrument [Line Items]
Long-term debt, including current installments on long-term debt	2,012,000		2,952,000
Other notes [Member]
Debt Instrument [Line Items]
Long-term debt, including current installments on long-term debt	$ 0		$ 13,000
Minimum [Member] \| Revenue Bond, fixed rate 5.9% to 6.0%, due 2024 through 2026 [Member]
Debt Instrument [Line Items]
Interest Rate, Stated Percentage	5.90%	7.25%
Minimum [Member] \| Medium-term Notes, fixed rate 8.75% to 8.89%, due 2016 through 2022 [Member]
Debt Instrument [Line Items]
Interest Rate, Stated Percentage	8.75%
Minimum [Member] \| Term Loans, fixed rate 2.95% due 2017 and 3.70% due 2020 [Member]
Debt Instrument [Line Items]
Interest Rate, Stated Percentage	2.95%
Maximum [Member] \| Revenue Bond, fixed rate 5.9% to 6.0%, due 2024 through 2026 [Member]
Debt Instrument [Line Items]
Interest Rate, Stated Percentage	6.00%	7.75%
Maximum [Member] \| Medium-term Notes, fixed rate 8.75% to 8.89%, due 2016 through 2022 [Member]
Debt Instrument [Line Items]
Interest Rate, Stated Percentage	8.89%
Maximum [Member] \| Term Loans, fixed rate 2.95% due 2017 and 3.70% due 2020 [Member]
Debt Instrument [Line Items]
Interest Rate, Stated Percentage	3.70%