Arrangements with Off-Balance Sheet Risk (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding surety bonds	$ 44,500,000
Guarantee obligations, up to	$ 120,000,000.0
Standard warranty period	1 year
Senior Credit Facility [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding commercial letters of credit	$ 45,300,000