Notes Payable - Convertible (Details) (USD $)
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6 Months Ended | 1 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | |||||||||||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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Jan. 31, 2013
2026 Notes [Member]
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Jun. 30, 2013
2026 Notes [Member]
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Dec. 31, 2012
2026 Notes [Member]
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Jun. 30, 2013
2028 Notes [Member]
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Dec. 31, 2012
2028 Notes [Member]
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Dec. 31, 2009
2028 Notes [Member]
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Jun. 30, 2013
Convertible Debt [Member]
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Jun. 30, 2012
Convertible Debt [Member]
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Jun. 30, 2013
Convertible Debt [Member]
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Jun. 30, 2012
Convertible Debt [Member]
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Debt Instrument [Line Items] | |||||||||||||||||||||||||||
Net Proceeds | $ 168,650,000 | [1],[2] | $ 228,576,000 | [1],[3],[4] | |||||||||||||||||||||||
Stated interest rate | 3.95% | [1],[2] | 5.125% | [1],[3],[4] | |||||||||||||||||||||||
Effective Interest Rate | 5.84% | [1],[2],[5] | 7.192% | [1],[3],[4],[5] | |||||||||||||||||||||||
Debt Issuance Costs | 3,850,000 | [1],[2] | 5,459,000 | [1],[3],[4],[6] | |||||||||||||||||||||||
Original Principal | 172,500,000 | [1],[2] | 234,035,000 | [1],[3],[4] | |||||||||||||||||||||||
Repurchases | (33,800,000) | [1],[2] | (11,000,000) | [1],[3],[4] | |||||||||||||||||||||||
Settled | (15,537,000) | (138,700,000) | [1],[2] | (91,000) | [1],[3],[4] | ||||||||||||||||||||||
Outstanding principal balance | 222,944,000 | 238,572,000 | 0 | [1],[2] | 15,537,000 | 222,944,000 | [1],[3],[4] | ||||||||||||||||||||
Conversion rate basis | 1 | 1 | |||||||||||||||||||||||||
Convertible notes payable, shares issued upon conversion | 42.6237 | 39.5360 | |||||||||||||||||||||||||
Conversion price | $ 23.4611 | $ 25.2934 | |||||||||||||||||||||||||
Repayments of convertible debt | 20,656,000 | 0 | 20,702,000 | 8,588,000 | |||||||||||||||||||||||
Gains (losses) on extinguishment of debt | 1,867,000 | ||||||||||||||||||||||||||
Write off of deferred debt issuance cost | 219,000 | ||||||||||||||||||||||||||
Principal amount of convertible debt | (20,711,000) | (22,193,000) | |||||||||||||||||||||||||
Remaining unamortized debt discount | 0 | (2,072,000) | |||||||||||||||||||||||||
Net carrying value of convertible debt | 202,233,000 | 214,307,000 | |||||||||||||||||||||||||
Noncash interest charges | 2,516,000 | 4,227,000 | 5,374,000 | 8,455,000 | |||||||||||||||||||||||
Contractual interest expense | 2,591,000 | 2,378,000 | 950,000 | 1,063,000 | 2,072,000 | 2,107,000 | |||||||||||||||||||||
Amortization of debt costs | 260,000 | 284,000 | 566,000 | 560,000 | |||||||||||||||||||||||
Total interest expense | 137,000 | 3,726,000 | 5,574,000 | 8,012,000 | 11,122,000 | ||||||||||||||||||||||
Convertible, If-converted value in rxcess of principal | 5,125,000 | 80,268,000 | 51,764,000 | ||||||||||||||||||||||||
Decrease to additional paid-in capital | $ 5,028,000 | ||||||||||||||||||||||||||
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