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Long-Term Debt (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Jun. 25, 2014
Dec. 31, 2013
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