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Notes Payable and Amounts Due Under Repurchase Agreements Notes Payable and Amounts Due Under Repurchase Agreements (2029 Notes Narrative) (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Convertible Debt [Member]
Dec. 31, 2012
Convertible Debt [Member]
Dec. 31, 2011
Convertible Debt [Member]
Feb. 10, 2014
December 2029 Notes [Member]
Dec. 31, 2013
December 2029 Notes [Member]
Debt Instrument [Line Items]                
Interest rate, stated percentage               5.25%
Principal amount of convertible senior notes payable at issuance               $ 115,800,000
Adjustments to additional paid in capital, equity component of convertible debt               15,600,000
Deferred income tax liability, equity component of convertible debt               11,000,000
Principal amount of convertible senior notes payable at issuance, issued for cash               52,200,000
Principal amount of convertible senior notes payable at issuance, issued in exchange of debt outstanding               63,600,000
Debt instrument, interest payment period               6 months
Convertible senior notes, contingent interest rate               0.50%
Debt instrument, number of days to measure stock value against conversion value               20 days
Debt instrument, consecutive trading day period to determine convertibility               30 days
Stock price must exceed conversion price to allow conversion               120.00%
Debt instrument, convertible, conversion price               $ 9.57
Debt instrument, convertible, number of equity instruments, shares               104.5
Debt instrument, face amount               1,000
Debt instrument, number of days of average closing stock price used in conversion value calculation               10 days
Debt instrument, number of consecutive trading days used to calculate average closing stock price for the conversion value               10 days
Debt instrument, redemption price, percentage               100.00%
Extinguishment of debt, amount             22,700,000 47,500,000
Extinguishment of debt, cash paid 168,700,000             74,800,000
Extinguishment of debt, cash paid for shares of common stock               34,900,000
Extinguishment of debt, shares issued             946,793 1,629,677
Extinguishment of debt, carrying value at extinguishment             21,600,000 44,500,000
Extinguishment of debt, gain (loss), net of tax             (1,700,000) (5,200,000)
Interest rate, effective percentage               11.90%
Interest expense on convertible notes $ 38,870,000 $ 28,479,000 $ 31,633,000 $ 26,400,000 $ 28,500,000 $ 31,600,000