NEW YORK -- The parting of ways last week between Calpine Corp. (NYSE:CPN - News) and its former independent auditor, Deloitte & Touche LLP, was a mutual decision and wasn't based on any unresolved disagreements, Calpine said Friday. The San Jose, Calif. power company and the accounting firm had previously wrangled over the accounting treatment of power sales agreements associated with power plants for which Calpine had used sale-leaseback transactions. Such transactions are central to Calpine's business model. Calpine agreed in early March to reclassify two sale-leasebacks as financial transactions instead of operating leases. In a Form 8-K filing to...