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Long-Term Debt (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 6 Months Ended | 6 Months Ended | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
|
Dec. 31, 2012
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Apr. 04, 2011
|
Mar. 31, 2011
Note Warrant2 [Member]
|
Dec. 31, 2012
Convertible Note Hedge 2 [Member]
|
Dec. 31, 2012
Convertible Note Hedge [Member]
|
Mar. 31, 2011
Note Warrant [Member]
|
Dec. 31, 2012
Convertible Note Hedge 1 [Member]
|
Dec. 31, 2012
Convertible Note/ Hedge Warrant, net [Member]
|
Mar. 29, 2011
Convertible Note Overallotment [Member]
|
Jun. 30, 2012
Convertible Debt [Member]
|
Jun. 30, 2013
Convertible Debt [Member]
|
Dec. 31, 2012
Convertible Debt [Member]
|
Dec. 31, 2012
Convertible Debt [Member]
Convertible Notes 2016 [Member]
|
Apr. 04, 2011
Convertible Debt [Member]
Convertible Notes 2016 [Member]
|
Mar. 29, 2011
Convertible Debt 1 [Member]
|
Jun. 30, 2012
Other Long-term Liabilities [Member]
Convertible Debt [Member]
|
Apr. 04, 2011
Other Long-term Liabilities [Member]
Convertible Debt [Member]
|
Jun. 30, 2012
Equity [Member]
Convertible Debt [Member]
|
Apr. 04, 2011
Equity [Member]
Convertible Debt [Member]
|
Mar. 30, 2011
Equity [Member]
Convertible Debt [Member]
|
Mar. 29, 2011
Equity [Member]
Convertible Debt [Member]
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| Debt Instrument [Line Items] | |||||||||||||||||||||||||
| Debt Instrument, Face Amount | $ 230,000,000 | ||||||||||||||||||||||||
| LONG-TERM DEBT | 204,500,000 | 204,500,000 | 200,400,000 | ||||||||||||||||||||||
| Interest Expense, Debt, Excluding Amortization | 1,438,000 | 1,438,000 | 2,876,000 | 2,875,000 | |||||||||||||||||||||
| Accretion of Discount | 2,105,000 | 1,964,000 | 4,139,000 | 3,863,000 | |||||||||||||||||||||
| Amortization of Financing Costs | 326,000 | 326,000 | 652,000 | 652,000 | |||||||||||||||||||||
| Proceeds from Issuance of Warrants | 4,100,000 | 27,600,000 | |||||||||||||||||||||||
| Senior Notes | 30,000,000 | 230,000,000 | 230,000,000 | 200,000,000 | 187,000,000 | 43,000,000 | |||||||||||||||||||
| Debt Instrument, Unamortized Discount | 25,470,000 | 25,470,000 | 29,609,000 | ||||||||||||||||||||||
| Senior Convertible Notes [Equity net of tax] | 28,000,000 | ||||||||||||||||||||||||
| Debt Conversion, Converted Instrument, Amount | 1,000 | ||||||||||||||||||||||||
| Debt Instrument, Convertible, Conversion Price | $ 55.69 | ||||||||||||||||||||||||
| Class of Warrant or Right, Outstanding | 0.5 | 3.5 | |||||||||||||||||||||||
| Warrant Option Strike Price | $ 64.09 | ||||||||||||||||||||||||
| Proceeds from (Payments for) Other Financing Activities | 5,600,000 | 42,700,000 | 37,100,000 | 10,900,000 | |||||||||||||||||||||
| Debt Instrument, Interest Rate, Effective Percentage | 7.00% | ||||||||||||||||||||||||
| Payments of Debt Issuance Costs | 8,000,000 | 6,500,000 | (1,500,000) | ||||||||||||||||||||||
| Debt Instrument, Interest Rate, Stated Percentage | 2.50% | ||||||||||||||||||||||||
| Debt Instrument, Convertible, Conversion Ratio | 17.958 | ||||||||||||||||||||||||
| Interest Expense | 3,869,000 | 3,728,000 | 7,667,000 | 7,390,000 | |||||||||||||||||||||
| Senior convertible notes net of unamortized discount | 204,530,000 | 204,530,000 | 200,391,000 | ||||||||||||||||||||||
| Long-term Debt, Fair Value | $ 247,000,000 | $ 247,000,000 | $ 245,200,000 | ||||||||||||||||||||||