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Debt and Credit Agreements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt	$ 1,877,000us-gaap_LongTermDebt	$ 1,752,000us-gaap_LongTermDebt
7.33% weighted-average fixed rate notes
Debt Instrument [Line Items]
Long-term debt	20,000	20,000
6.51% weighted-average fixed rate notes
Debt Instrument [Line Items]
Long-term debt	425,000	425,000
9.78% fixed rate notes
Debt Instrument [Line Items]
Long-term debt	67,000	67,000
5.58% weighted-average fixed rate notes
Debt Instrument [Line Items]
Long-term debt	175,000	175,000
3.65% weighted-average fixed rate notes
Debt Instrument [Line Items]
Long-term debt	925,000	925,000
Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	$ 265,000	$ 140,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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