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Significant Accounting Policies Fair value (Notes)
6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value Disclosures [Text Block]
Fair Value
Embedded in certain series of the Company’s convertible debt securities are derivative instruments - contingent interest provisions, interest reset provisions and contingent conversion parity provisions. The embedded derivatives are valued quarterly using Level 3 inputs, and at June 30, 2015 and December 31, 2014, the values of the derivatives embedded in the convertible debt securities were not material. See “Note 5 - Debt”.