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Long-Term Debt (Details) (USD $) | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended
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Jun. 30, 2012 | Jul. 02, 2011 | Mar. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2012 Convertible Senior Debentures 2040 [Member] | Jul. 02, 2011 Convertible Senior Debentures 2040 [Member] | Jun. 30, 2012 Convertible Senior Debentures 2040 [Member] | Jul. 02, 2011 Convertible Senior Debentures 2040 [Member] | Dec. 31, 2011 Convertible Senior Debentures 2040 [Member] | Jun. 30, 2012 Convertible Senior Debentures 2041 [Member] | Jul. 02, 2011 Convertible Senior Debentures 2041 [Member] | Jun. 30, 2012 Convertible Senior Debentures 2041 [Member] | Jul. 02, 2011 Convertible Senior Debentures 2041 [Member] | Dec. 31, 2011 Convertible Senior Debentures 2041 [Member] | Jun. 30, 2012 Convertible Senior Debentures 2042 [Member] | Jun. 30, 2012 Convertible Senior Debentures 2042 [Member]
Long-Term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility | $ 160,000,000 |  |  | $ 155,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Exchangeable unsecured notes, due 2102 | 95,042,000 |  |  | 95,042,000 |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior debentures |  |  |  |  | 99,251,000 |  | 99,251,000 |  | 98,463,000 | 50,996,000 |  | 50,996,000 |  | 50,549,000 | 56,884,000 | 56,884,000
Long-term Debt | 462,173,000 |  |  | 399,054,000 |  |  |  |  |  |  |  |  |  |  |  |
Less current portion | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, less current portion | 462,173,000 |  |  | 399,054,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior debentures issuance date |  |  |  |  |  |  | Nov. 09, 2010 |  |  |  |  | May 13, 2011 |  |  |  | May 31, 2012
Principal amount of convertible senior debentures |  |  |  |  | 275,000,000 |  | 275,000,000 |  | 275,000,000 | 150,000,000 |  | 150,000,000 |  | 150,000,000 | 150,000,000 | 150,000,000
Common stock, shares repurchased (in shares) | 13,948,687 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,948,687
Treasury stock, value, acquired, cost method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000
Principal amount of the debentures |  |  |  |  | 275,000,000 |  | 275,000,000 |  | 275,000,000 | 150,000,000 |  | 150,000,000 |  | 150,000,000 | 150,000,000 | 150,000,000
Unamortized discount |  |  |  |  | (176,310,000) |  | (176,310,000) |  | (177,131,000) | (99,430,000) |  | (99,430,000) |  | (99,843,000) | (93,394,000) | (93,394,000)
Embedded derivative |  |  |  |  | 561,000 |  | 561,000 |  | 594,000 | 426,000 |  | 426,000 |  | 392,000 | 278,000 | 278,000
Carrying value of liability component |  |  |  |  | 99,251,000 |  | 99,251,000 |  | 98,463,000 | 50,996,000 |  | 50,996,000 |  | 50,549,000 | 56,884,000 | 56,884,000
Equity component - net carrying value |  |  |  |  | 110,094,000 |  | 110,094,000 |  | 110,094,000 | 62,246,000 |  | 62,246,000 |  | 62,246,000 | 57,874,000 | 57,874,000
Stated rate of interest on convertible senior debentures (in hundredths) |  |  |  |  | 2.25% |  | 2.25% |  |  | 2.25% |  | 2.25% |  |  | 2.25% | 2.25%
Effective rate of interest on convertible senior debentures (in hundredths) |  |  |  |  |  |  | 8.00% |  |  |  |  | 8.375% |  |  |  | 7.50%
Contractual coupon interest |  |  |  |  | 1,547,000 | 1,547,000 | 3,094,000 | 3,094,000 |  | 844,000 | 441,000 | 1,688,000 | 441,000 |  | 291,000 | 291,000
Non-cash amortization of debt discount | 1,308,000 | 861,000 |  |  | 414,000 | 383,000 | 821,000 | 759,000 |  | 209,000 | 102,000 | 413,000 | 102,000 |  | 74,000 | 74,000
Non-cash amortization of deferred financing costs |  |  |  |  | 22,000 | 22,000 | 44,000 | 44,000 |  | 12,000 | 6,000 | 24,000 | 6,000 |  | 5,000 | 5,000
Non-cash change in value of derivative liability |  |  |  |  | 71,000 | 69,000 | (33,000) | 8,000 |  | 109,000 | 2,000 | 34,000 | 2,000 |  | 42,000 | 42,000
Total interest expense related to the debentures |  |  |  |  | 2,054,000 | 2,021,000 | 3,926,000 | 3,905,000 |  | 1,174,000 | 551,000 | 2,159,000 | 551,000 |  | 412,000 | 412,000
Debt instrument percentage of conversion price (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% | 130.00%
Debt instrument, conversion price amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.35
Debt instrument, Percentage of sale price of common stock (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98.00% | 98.00%
Debt instrument, initial conversion shares of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 84.6937 | 84.6937
Debt instrument, principal amount of debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 | 1,000
Debt instrument, initial conversion price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.81 | $ 11.81
Debt instrument, percentage of initial conversion price premium (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.75% | 13.75%
Debt instrument, conversion price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.38 | $ 10.38
Line of Credit Facility, Maximum Borrowing Capacity | 528,000,000 |  | 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amendment Fee Amount | $ 390,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 12-16, 44A, 44B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44A -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44A, 44B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44A, 44B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 12-16, 44A, 44B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44A -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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