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Long-Term Debt (Details 2) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
2.25% Convertible Senior Notes due 2036 [Member]
    
Contractual interest expense and the discount amortization    
Year-to-date contractual interest expense $ 2,056 $ 2,056
Year-to-date discount amortization 3,998 [1] 3,689 [1]
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 1,679 1,725
Year-to-date discount amortization $ 1,693 [2] $ 1,588 [2]
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.
[2] Represents the incremental impact of the accounting for convertible debt as primarily codified in ASC 470, Debt