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Debt (Details) (USD $)
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3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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| Debt Instrument [Line Items] | |||||
| Gains (Losses) on Extinguishment of Debt | $ (8,419,000) | $ (55,652,000) | |||
| Long-term Debt, Gross | 2,426,257,000 | 2,426,257,000 | 2,500,434,000 | ||
| Interest rate swap agreements | 18,041,000 | 18,041,000 | 18,671,000 | ||
| Debt Instrument, Unamortized Discount | (537,115,000) | (537,115,000) | (573,082,000) | ||
| Debt, Current | (495,713,000) | (495,713,000) | (527,204,000) | ||
| Long-term Debt, Excluding Current Maturities | 1,411,470,000 | 1,411,470,000 | 1,418,819,000 | ||
| Debt Instrument, Interest Rate, Stated Percentage | 7.75% | 7.75% | |||
| Letters of Credit Outstanding, Amount | 14,000,000 | 14,000,000 | |||
| Derivative, Basis Spread on Variable Rate | 4.19% | 4.19% | |||
| Amortization of Financing Costs | 1,000,000 | 1,000,000 | 3,000,000 | 3,000,000 | |
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Current Revolving Credit Facility [Member]
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| Debt Instrument [Line Items] | |||||
| Long-term Debt, Gross | 0 | 0 | 0 | ||
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Senior Term Loan [Member]
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| Debt Instrument [Line Items] | |||||
| Long-term Debt, Gross | 382,500,000 | 382,500,000 | 398,438,000 | ||
| Debt Instrument, Interest Rate, Stated Percentage | 1.91% | 1.91% | |||
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7.75% Senior Subordinated Notes, Due 2020 [Member]
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| Debt Instrument [Line Items] | |||||
| Long-term Debt, Gross | 400,000,000 | 400,000,000 | 400,000,000 | ||
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3.75% Convertible Senior Subordinated Notes, due 2025 [Member]
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| Debt Instrument [Line Items] | |||||
| Debt Instrument, Repurchased Face Amount | 52,000,000 | 52,000,000 | |||
| Cash Paid for Debt Repurchased | 134,000,000 | ||||
| Long-term Debt, Gross | 79,979,000 | 79,979,000 | 132,408,000 | ||
| Debt Instrument, Unamortized Discount | (26,178,000) | (26,178,000) | (45,098,000) | ||
| treasury stock method average share price to include dilutive securities | $ 26.84 | ||||
| conversion threshold | 34.89 | 34.89 | |||
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4.00% Junior Subordinated Convertible Debentures, due 2033 [Member]
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| Debt Instrument [Line Items] | |||||
| Long-term Debt, Gross | 307,122,000 | 307,122,000 | 307,153,000 | ||
| Debt Instrument, Unamortized Discount | (118,998,000) | (118,998,000) | (121,017,000) | ||
| treasury stock method average share price to include dilutive securities | $ 40.82 | ||||
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4.0% Junior Subordinated debt due 2033 [Domain]
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| Debt Instrument [Line Items] | |||||
| conversion threshold | 53.07 | 53.07 | |||
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3.25% Convertible Senior Debentures, Due 2035 [Member]
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| Debt Instrument [Line Items] | |||||
| Long-term Debt, Gross | 427,500,000 | 427,500,000 | 427,500,000 | ||
| Debt Instrument, Unamortized Discount | (22,081,000) | (22,081,000) | (34,374,000) | ||
| treasury stock method average share price to include dilutive securities | $ 77.88 | ||||
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3.75% Convertible Senior Subordinated Notes Due 2042 [Member]
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| Debt Instrument [Line Items] | |||||
| Long-term Debt, Gross | 390,000,000 | 390,000,000 | 390,000,000 | ||
| Debt Instrument, Unamortized Discount | (163,611,000) | (163,611,000) | (164,986,000) | ||
| treasury stock method average share price to include dilutive securities | $ 41.05 | ||||
| conversion threshold | 53.37 | 53.37 | |||
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3.5% Convertible senior subordinated debt [Domain]
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| Debt Instrument [Line Items] | |||||
| Long-term Debt, Gross | 424,250,000 | 424,250,000 | 424,250,000 | ||
| treasury stock method average share price to include dilutive securities | $ 70.00 | ||||
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Capitalized Lease and Other Debt Obligations [Member]
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| Debt Instrument [Line Items] | |||||
| Long-term Debt, Gross | $ 14,906,000 | $ 14,906,000 | $ 20,685,000 | ||