Summary of Siginificant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2016
Revenue Recognition
Minimum term of extended warranty contracts sold	5 years
Maximum term of extended warranty contracts sold	10 years
Sale/leaseback transactions
Lease Term	6 years
Minimum
Research and Development.
Cost Sharing Percentages of research and development contracts	30.00%
Maximum
Research and Development.
Cost Sharing Percentages of research and development contracts	50.00%