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Long-Term Debt (Details 2) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
2.25% Convertible Senior Notes due 2036 [Member]
    
Contractual interest expense and the discount amortization    
Year-to-date contractual interest expense $ 1,875 $ 3,084
Year-to-date discount amortization 5,366 5,590
Debt Instrument, Interest Rate, Effective Percentage 7.70% 7.70%
3.00% Convertible Senior Notes due 2020 [Member]
    
Contractual interest expense and the discount amortization    
Year-to-date contractual interest expense 1,839 2,588
Year-to-date discount amortization $ 1,810 [1] $ 2,410 [1]
Debt Instrument, Interest Rate, Effective Percentage 8.60% 8.60%
[1] Represents the incremental impact of the accounting for convertible debt as primarily codified in ASC 470, Debt