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number of consecutive trading days (day) Debt Instrument, Convertible, Threshold Consecutive Trading Days Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Due in three to five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, After Year Two Through Five Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, After Year Two Through Five Revenue Revenues [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Numerator Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]