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Long-Term Debt (Details 1) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Jun. 25, 2014 | Dec. 31, 2013
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2.25% Convertible Senior Notes due 2036 [Member] |  |  |
Carrying value of Notes related discount and equity component |  |  |
Carrying amount of equity component | $ 65,270 |  | $ 65,270
Allocated underwriter fees, net of taxes | (1,475) |  | (1,475)
Allocated debt issuance cost, net of taxes | (58) |  | (58)
Total net equity component | 63,737 |  | 63,737
Deferred income tax component | 6,524 |  | 8,023
Debt Instrument, Face Amount | 182,753 |  | 182,753
Unamortized discount | (17,511) |  | (21,574)
Unamortized underwriter fees | (686) |  | (845)
Secured Long-term Debt, Noncurrent | 164,556 |  | 160,334
Unamortized debt issuance cost | 27 |  | 33
3.00% Convertible Senior Notes due 2020 [Member] |  |  |
Carrying value of Notes related discount and equity component |  |  |
Carrying amount of equity component | 4,973 |  | 25,359
Allocated underwriter fees, net of taxes | (149) |  | (760)
Allocated debt issuance cost, net of taxes | (22) |  | (112)
Total net equity component | 4,802 |  | 24,487
Deferred income tax component | 1,936 |  | 10,625
Debt Instrument, Face Amount | 22,550 | 115,000 | 115,000
Unamortized discount | (5,348) |  | (29,094)
Unamortized underwriter fees | (295) |  | (1,601)
Secured Long-term Debt, Noncurrent | 16,907 |  | 84,305
Unamortized debt issuance cost | $ 44 |  | $ 236

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